-
Comment on the reactions of dihydrogen
with
Chlorine (ii) Sodium and (iii) Copper(II)oxide.
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Would you expect the hydrides of N, O and F to have lower
boiling points than the hydrides of their subsequent group members? Give
reason.
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-
Can phosphorus with outer electronic configuration \[3{{s}^{2}}3{{p}^{3}}\]
form \[P{{H}_{5}}\]?
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-
How many hydrogen bonded water molecules are associated in\[CuS{{O}_{4}}.5{{H}_{2}}O?\]
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-
Calculate the strength of 10 volume solution of hydrogen
peroxide.
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-
Justify the position of hydrogen in the periodic table on
the basis of its electronic configuration.
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-
Write the names of isotopes of hydrogen. What is the mass
ratio of these isotopes?
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-
Why does hydrogen occur in diatomic form rather than in
mono-atomic form under normal conditions?
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-
How can the production of dihydrogen, obtained from coal
gasification be increased?
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-
Describe the bulk preparation of dihydrogen by electrolytic
method. What is the role of an electrolyte in this process?
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-
Complete the following:
(i) \[{{H}_{2}}(g)+{{M}_{m}}{{O}_{o}}(s)\xrightarrow{Heat}\]
(ii) \[CO(g)+{{H}_{2}}(g)\xrightarrow[Catayst]{Heat}\]
(iii) \[{{C}_{3}}{{H}_{g}}(g)+3{{H}_{2}}O(g)\xrightarrow[Catayst]{Heat}\]
(iv) \[Zn(s)+NaOH(aq)\xrightarrow{Heat}\]
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-
Discuss the consequences of high enthalpy of H-H in terms of
chemical reactivity.
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-
What do you understand by (i) electron deficient (ii)
electron precise and (iii) electron rich compounds of hydrogen? Provide
justification with suitable examples.
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-
What characteristics do you expect from electron deficient
hydrides with respect to its structure and chemical reactivity?
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-
Do you expect the carbon hydride of the type \[({{C}_{n}}{{H}_{2n+2}})\]to
act as Lewis acid or base? Justify your answer.
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-
What do you understand by the term non-stoichiometric
hydrides? Do you expect these types of hydrides to be formed by alkali metals? Justify
your answer.
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-
How do you expect the metallic hydrides to be useful for
hydrogen storage? Explain.
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-
How does atomic hydrogen or oxy-hydrogen torch function for
cutting and welding purposes? Explain.
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-
Among \[N{{H}_{3}}{{H}_{2}}O\] and HF which would you expect
to have highest magnitude of hydrogen bonding and why?
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Saline hydrides such as \[NaH\] or \[Ca{{H}_{2}}\] react
with water violently producing fire. Can\[C{{O}_{2}}\], a well known fire extinguisher,
be used in this case? Explain.
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Arrange the
following:
(i) \[Ca{{H}_{2}},Be{{H}_{2}}\]
and \[Ti{{H}_{2}}\] in order of increasing electrical conductance.
(ii) \[\text{LiH},\text{
NaH},\text{ CsH}\] in order of increasing ionic nature.
(iii) HH, DD and
FF in order of increasing bond dissociation energy.
(iv) \[NaH,Mg{{H}_{2}}\] and \[{{H}_{2}}O\] in order of
increasing reducing property.
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Compare the structures of \[{{H}_{2}}O\] and\[{{H}_{2}}{{O}_{2}}\].
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-
What do you understand by the term autoprotolysis' of
water? What is its significance?
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-
Consider the reaction of water with \[{{F}_{2}}\] and
suggest in terms of oxidation and reduction, which species are oxidised/reduced.
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-
Complete the
following reactions:
(i) \[PbS(s)+{{H}_{2}}{{O}_{2}}(aq)\to
\]
(ii) \[MnO_{4}^{-}(aq)+{{H}_{2}}{{O}_{2}}(aq)\to
\]
(iii) \[CaO(s)+{{H}_{2}}O(g)\to
\]
(iv) \[AlC{{l}_{3}}(g)+{{H}_{2}}O(l)\xrightarrow{{}}\]
(v) \[C{{a}_{3}}{{N}_{2}}(s)+{{H}_{2}}O(l)\xrightarrow{{}}\]
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Describe the structure of the common form of ice.
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-
What causes the temporary and permanent hardness of water?
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-
Discuss the principle and method of softening of hard water
by synthetic ion exchange resins.
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-
Write chemical
reactions to show amphoteric nature of water.
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-
Write chemical reactions to justify that hydrogen peroxide
can function as an oxidising as well as a reducing agent.
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-
What is demineralised water and how it can obtained?
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-
Is demineralised water or distilled water is useful for drinking
purposes? If not, how it can be made useful?
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-
Describe the usefulness of water in biosphere and biological
systems.
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-
What properties of water make
it useful as a solvent?
What type of compounds can it (i) dissolve (ii) hydrolyse?
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-
Knowing the
properties of \[{{H}_{2}}O\] and \[{{D}_{2}}O\], do you think that \[{{D}_{2}}O\]
can be used for drinking purposes?
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-
What is the difference between hydrolysis and hydration?
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-
How can saline hydrides remove traces of water from organic
compounds?
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-
What do you expect the nature of hydrides if formed by
elements of atomic numbers 15, 19, 23, 44 with dry dihydrogen? Compare their
behaviour towards water.
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-
Do you expect different products in solution when aluminium
(III) chloride and potassium chloride are treated with (i) normal water, (ii)
acidified water, (iii) alkaline water.
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How does \[{{H}_{2}}{{O}_{2}}\] behave as a bleaching agent?
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question_answer41)
Hydrogen
resembles halogens in many respects for which several factors are responsible.
Of the following factors which one is most important in this respect?
(a)
Its tendency to lose an electron to form a cation
(b)
Its tendency to gain a single electron in its valence shell to attain stable
electronic configuration
(c)
Its low negative electron gain enthalpy value
(d)
Its small size
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question_answer42)
Why
does \[{{H}^{+}}\] ion always get associated with other atoms or molecules?
(a)
lonisation enthalpy of hydrogen resembles that of alkali metals
(b)
Its reactivity is similar to halogens
(c)
It resembles both alkali metals and halogens
(d)
Loss of an electron from hydrogen atom results in a nucleus of very small size
as compared to other atoms orions. Due to small size it cannot exist free
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question_answer43)
Metal
hydrides are ionic, covalent or molecular in nature.
Among\[LiH,\text{
}NaH,\text{ }KH,\text{ }RbH,\text{ }CsH\], the correct order of increasing
ionic character is:
(a)
\[LiH>NaH>CsH>KH>RbH\] (b) \[LiH<NaH<KH<RbH<CsH\]
(c)
\[RbH>CsH>NaH>KH>LiH\] (d) \[NaH>CsH>RbH>LiH>KH\]
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question_answer44)
Which
of the following hydrides is electron deficient hydride?
(a)
\[{{B}_{2}}{{H}_{6}}\] (b)\[N{{H}_{3}}\] (c)
\[{{H}_{2}}O\] (d) \[C{{H}_{4}}\]
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question_answer45)
Radioactive
elements emit a, P and y-rays and are characterised by their half-lives. The
radioactive isotope of hydrogen is:
(a)
protium (b) deuterium (c) tritium (d)
hydronium
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question_answer46)
Consider
the reactions :
(a)\[{{H}_{2}}{{O}_{2}}+2HI\to
{{I}_{2}}+2{{H}_{2}}O\]
(b)
\[HOCl+{{H}_{2}}{{O}_{2}}\to {{H}_{3}}{{O}^{+}}+C{{l}^{-}}+{{O}_{2}}\]
which
of the following statements is correct about \[{{H}_{2}}{{O}_{2}}\]with
reference to these reactions? Hydrogen peroxide is
(a)
an oxidising agent in both (A) and (B)
(b)
an oxidising agent in (A) and reducing agent in (B)
(c)
a reducing agent in (A) and oxidising agent in (B)
(d)
a reducing agent in both (A) and (B)
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question_answer47)
The
oxide that gives \[{{H}_{2}}{{O}_{2}}\] on treatment with dilute \[{{H}_{2}}S{{O}_{4}}\]is.......
(a)\[Pb{{O}_{2}}\] (b)\[Ba{{O}_{2}}\cdot
8{{H}_{2}}O\] (c)\[Mn{{O}_{2}}\] (d) \[Ti{{O}_{2}}\]
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question_answer48)
Which
of the following equations depict the oxidising nature of\[{{H}_{2}}{{O}_{2}}\]?
(a)\[2MnO_{4}^{-}+6{{H}^{+}}5{{H}_{2}}{{O}_{2}}\to
2M{{n}^{2+}}+8{{H}_{2}}O+5{{O}_{2}}\]
(b)
\[2F{{e}^{3+}}+2{{H}^{+}}+{{H}_{2}}{{O}_{2}}\to
2F{{e}^{2+}}+2{{H}_{2}}O+{{O}_{2}}\]
(c)
\[2{{I}^{-}}+2{{H}^{+}}+{{H}_{2}}{{O}_{2}}\to {{I}_{4}}+2{{H}_{2}}O\]
(d)
\[KI{{O}_{4}}+{{H}_{2}}{{O}_{2}}\to KI{{O}_{3}}+{{H}_{2}}O+{{O}_{2}}\]
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question_answer49)
Which
of the following equations depicts reducing nature of\[{{H}_{2}}{{O}_{2}}\]?
(a)
\[2{{[Fe{{(CN)}_{6}}]}^{4-}}2{{H}^{+}}+{{H}_{2}}{{O}_{2}}\to
2{{[Fe{{(CN)}_{6}}]}^{3-}}+2{{H}_{2}}O\]
(b)
\[{{I}_{2}}+{{H}_{2}}{{O}_{2}}+2O{{H}^{-}}\to 2{{I}^{-}}2{{H}_{2}}O+{{O}_{2}}\]
(c)
\[M{{n}^{2+}}+{{H}_{2}}{{O}_{2}}\to M{{n}^{2+}}+2O{{H}^{-}}\]
(d)
\[PbS+4{{H}_{2}}{{O}_{2}}\to PbS{{O}_{4}}+4{{H}_{2}}O\]
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question_answer50)
Hydrogen
peroxide is..........
(a)
an oxidising agent (b) a
reducing agent
(c)
both an oxidising and a reducing agent (d) neither oxidising nor
reducing agent
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question_answer51)
Which
of the following reactions increases production of dihydrogen from synthesis
gas?
(a)
\[C{{H}_{2}}(g)+{{H}_{2}}O(g)\xrightarrow[Ni]{127K}CO(g)+3{{H}_{2}}(g)\] (b) \[C(s)+{{H}_{2}}O(g)\xrightarrow{1270K}CO(g)+{{H}_{2}}(g)\]
(c)
\[CO(g)+{{H}_{2}}O(g)\xrightarrow[catayst]{673K}C{{O}_{2}}(g)+{{H}_{2}}(g)\] (d)
\[{{C}_{2}}{{H}_{6}}+2{{H}_{2}}O\xrightarrow[Ni]{1270K}2CO+5{{H}_{2}}\]
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question_answer52)
When
sodium peroxide is treated with dilute sulphuric acid, we get.......
(a)
sodium sulphate and water (b) sodium sulphate
and oxygen
(c)
sodium sulphate, hydrogen and oxygen (d) sodium sulphate and hydrogen
peroxide
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question_answer53)
Hydrogen
peroxide is obtained by the electrolysis of :
(a)
water (b) sulphuric acid (c)
hydrochloric acid (d) fused sodium peroxide
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question_answer54)
Which
of the following reactions is an example of use of water gas in the synthesis
of other compounds?
1970
V.
(a)
\[C{{H}_{4}}(g)+{{H}_{2}}O(g)\xrightarrow[Ni]{1270K}CO(g)+{{H}_{2}}(g)\] (b) \[CO(g)+{{H}_{2}}O(g)\xrightarrow[catalyst]{673K}C{{O}_{2}}(g)+{{H}_{2}}(g)\]
(c)
\[{{C}_{n}}{{H}_{2n+2}}+n{{H}_{2}}O(g)\xrightarrow[Ni]{1270K}nCO(g)+(2n+1){{H}_{2}}(g)\] (d)
\[CO(g)+2{{H}_{2}}(g)\xrightarrow[catayst]{cobalt}C{{H}_{3}}OH(l)\]
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question_answer55)
Which
of the following ions will cause hardness in water sample?
(a)
\[C{{a}^{2+}}\] (b) \[N{{a}^{+}}\] (c)
\[C{{l}^{-}}\] (d) \[{{K}^{+}}\]
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question_answer56)
Which
of the following compounds is used for water softening?
(a)\[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}\] (b)
\[N{{a}_{3}}P{{O}_{4}}\] (c)\[N{{a}_{5}}{{P}_{6}}{{O}_{18}}\] (d)\[N{{a}_{2}}HP{{O}_{4}}\]
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question_answer57)
Elements
of which of the following group(s) of periodic table do not form hydrides?
(a)
groups 7,8,9 (b) group 13 (c) groups
15,16,17 (d) group 14
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question_answer58)
Only
one element of ...... forms hydride.
(a)
group 6 (b) group 7 (c) group
8 (d) group 9
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question_answer59)
Which
of the following statements are not true for hydrogen?
(a)
It exists as diatomic molecule.
(b)
It has one electron in the outermost shell.
(c)
It can lose an electron to form a cation which can freely exist.
(d)
It forms a large number of ionic compounds by losing an electron.
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question_answer60)
Dihydrogen
can be prepared on commercial scale by different methods. In its preparation by
the action of steam on hydrocarbons, a mixture of \[CO\]and \[{{H}_{2}}\] gas
is formed. It is known as...... .
(a)
water gas (b) syngas (c)
producer gas (d) industrial gas
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question_answer61)
Which
of the following statements) is/are correct in the case of heavy water?
(a)
Heavy water is used as a moderator in nuclear reactor.
(b)
Heavy water is more effective solvent than ordinary water.
(c)
Heavy water is more associated than ordinary water.
(d)
Heavy water has lower boiling point than ordinary water.
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question_answer62)
Which
of the following statements about hydrogen are correct?
(a)
Hydrogen has three isotopes of which protium is most common.
(b)
Hydrogen never acts as cation in ionic salts.
(c)
Hydrogen ion,\[{{H}^{+}}\], exists freely in solution.
(d)
Dihydrogen does not act as a reducing agent.
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question_answer63)
Some
of the properties of water are described below. Which of them is/are not
correct?
(a)
Water is known to be a universal solvent.
(b)
Hydrogen bonding is present to a large extent in liquid water.
(c)
There is no hydrogen bonding in the frozen state of water.
(d)
Frozen water is heavier than liquid water.
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question_answer64)
Hardness
of water may be temporary or permanent. Permanent hardness is due to the
presence of:
(a)
chlorides of\[~Ca\] and \[Mg\]in water
(b)
sulphates of \[~Ca\]and \[Mg\] in water
(c)
hydrogen carbonates of Ca and Mg in water
(d)
carbonates of alkali metals in water
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question_answer65)
Which
of the following statements are correct?
(a)
Elements of group 15 form electron deficient hydrides.
(b)
All elements of group 14 form electron precise hydrides.
(c)
Electron precise hydrides have tetrahedral geometries.
(d)
Electron rich hydrides can act as Lewis acids.
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question_answer66)
Which
of the following statements are correct?
(a)
Hydrides of group 13 act as Lewis acids.
(b)
Hydrides of group 14 are electron deficient hydrides.
(c)
Hydrides of group 14 act as Lewis acids.
(d)
Hydrides of group 15 act as Lewis bases.
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question_answer67)
Which
of the following statements are correct?
(a)
Metallic hydrides are deficient of hydrogen.
(b)
Metallic hydrides conduct heat and electricity.
(c)
Ionic hydrides do not conduct electricity in solid state.
(d)
Ionic hydrides are very good conductors of electricity in solid state.
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question_answer68)
How
can production of hydrogen from water gas be increased by using water gas shift
reaction?
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question_answer69)
What
are metallic/interstitial hydrides? How do they differ from molecular hydrides?
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question_answer70)
Name
the classes of hydrides to which \[{{H}_{2}}{{O}_{2}},{{B}_{2}}{{H}_{6}}\] and\[NaH\]
belong.
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question_answer71)
If
same mass of liquid water and a piece of ice is taken, then why is the density
of ice less than that of liquid water?
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question_answer72)
Compare
the following equations :
(i)
\[PbS(s)+{{H}_{2}}O(aq.)\to \]
(ii)
\[CO(g)+2{{H}_{2}}(g)\xrightarrow[Catayst]{Cobalt}\]
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question_answer73)
Give
reasons :
(i)
Lakes freeze from top towards bottom.
(ii)
Ice floats on water.
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question_answer74)
What
do you understand by the term 'auto protolysis of water'? What is its
significance?
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question_answer75)
Discuss
briefly demineralisation of water by ion exchange resin.
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question_answer76)
Molecular
hydrides are classified as electron deficient, electron precise and electron
rich compounds. Explain each type with two examples.
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question_answer77)
How
is heavy water prepared? Compare its physical properties with those of ordinary
water.
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question_answer78)
Write
one chemical reaction for the preparation of\[{{D}_{2}}{{O}_{2}}\].
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question_answer79)
Calculate
the strength of 5 volume \[{{H}_{2}}{{O}_{2}}\] solution.
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question_answer80)
(i)
Draw the gas phase and solid phase structure of\[{{H}_{2}}{{O}_{2}}\].
(ii)\[{{H}_{2}}{{O}_{2}}\]is
a better oxidising agent than water. Explain.
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question_answer81)
Melting
point, enthalpy of vaporisation and viscosity data of \[{{H}_{2}}{{O}_{2}}\]
and \[{{D}_{2}}{{O}_{2}}\] are given below :
|
|
\[{{H}_{2}}O\]
|
\[{{D}_{2}}O\]
|
|
Melting
point
|
373.0
|
374.4
|
|
Enthalpy of
vaporization at\[(373K)/kJmo{{l}^{-1}}\]
|
40.66
|
41.61
|
|
Viscosity/centipoise
|
0.8903
|
1.107
|
On the
basis of this data, explain in which of these liquids intermolecular forces are
stronger.
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question_answer82)
Dihydrogen
reacts with dioxygen\[({{O}_{2}})\] to form water. Write the name and formula
of the product when the isotope of hydrogen which has one proton and one
neutron in its nucleus is treated with oxygen. Will the reactivity of both the
isotopes be the same towards oxygen? Justify your answer.
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question_answer83)
Explain
why \[HCl\]is a gas and HF is a liquid?
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question_answer84)
When
the first element of the periodic table is treated with dioxygen, it gives a
compound whose solid state floats on its liquid state. This compound has an
ability to act as an acid as well as a base. What products will be formed when
the compound undergoes auto ionisation?
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question_answer85)
Rohan
heard that instructions were given to the laboratory attendant to store a
particular chemical, i.e., to keep it in a dark room, add some urea to it and
keep it away from dust. This chemical acts as an oxidising as well as a
reducing agent in both acidic and alkaline media. This chemical is important
for use in pollution control treatment of domestic and industrial effluents.
(i)
Write the name of this compound.
(ii)
Explain why such precautions are taken for storing the chemical?
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question_answer86)
Give
reasons why hydrogen resembles alkali metals?
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question_answer87)
Hydrogen
generally forms covalent compounds. Give reason.
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question_answer88)
Why
is the ionisation enthalpy of hydrogen higher than that of sodium?
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question_answer89)
Basic
principle of hydrogen economy is transportation and storage of energy in the
form of liquid or gaseous hydrogen.
Which
property of hydrogen may be useful for this purpose?
Support
your answer with chemical equation if required.
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question_answer90)
What
is the importance of heavy water?
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question_answer91)
Write
the Lewis structure of hydrogen peroxide.
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question_answer92)
An
acidic solution of hydrogen peroxide behaves as an oxidising as well as a
reducing agent, illustrate it with the help of a chemical equation.
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question_answer93)
With
the help of suitable examples, explain the property of\[{{H}_{2}}{{O}_{2}}\]
that is responsible for its bleaching action.
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question_answer94)
Why
is water molecule polar?
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question_answer95)
Why
does water show high boiling point as compared to hydrogen sulphide? Give
reasons for your answer.
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question_answer96)
Why
can dilute solutions of \[{{H}_{2}}{{O}_{2}}\] not be concentrated by heating?
How can concentrated solution of \[{{H}_{2}}{{O}_{2}}\]be obtained?
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question_answer97)
Why
is hydrogen peroxide stored in wax lined bottles?
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question_answer98)
Why
does hard water not form lather with soap?
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question_answer99)
Phosphoric
acid is preferred over sulphuric acid in preparing hydrogen peroxide. Why?
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question_answer100)
How
will you account for \[104.5{}^\circ \]bond angle in water?
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question_answer101)
Write
redox reactions between fluorine and water.
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question_answer102)
Write
two reactions to explain amphoteric nature of water.
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question_answer103)
Correlate
the items listed in Column I with those listed in Column II. Find out as many
correlations as you can.
|
Column I
|
Column II
|
|
(i) Synthesis gas
|
(a) \[N{{a}_{2}}\left[
N{{a}_{4}}{{(P{{O}_{4}})}_{6}} \right]\]
|
|
(ii) Dihydrogen
|
(b) Oxidising agent
|
|
(iii) Heavy water
|
(c) Softening of water
|
|
(iv) Calgon
|
(d) Reducing agent
|
|
(v) Hydrogen peroxide
|
(e) Stoichiometric
compounds of s-block elements
|
|
(vi) Salt like hydrides
|
(f) Prolonged
electrolysis of water
|
|
|
(g) \[Zn+NaOH\]
|
|
|
(h) \[Zn\text{ }+\text{
}dil.\text{ }{{H}_{2}}S{{O}_{4}}\]
|
|
|
(i) Synthesis of \[C{{H}_{3}}OH\]
|
|
|
(j) Mixture of CO and \[{{H}_{2}}\]
|
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question_answer104)
Match
Column I with Column II for the given properties/applications.
|
Column I
|
Column II
|
|
(i) H
|
(a) Used in the name of
perhydrol
|
|
(ii) \[{{H}_{2}}\]
|
(b) Can be reduced to
dihydrogen by \[NaH\]
|
|
(iii) \[{{H}_{2}}O\]
|
(c) Can be used in
hydroformy- lation of olefin
|
|
(iv) \[{{H}_{2}}{{O}_{2}}\]
|
(d) Can be used in
cutting and welding
|
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question_answer105)
Match
the terms in Column I with relevant item in Column II.
|
Column I
|
Column II
|
|
(i) Electrolysis of
water produces
|
(a) atomic reactor
|
|
(ii) Lithium aluminium
hydride is used as
|
(b) polar molecule
|
|
(iii) Hydrogen chloride
is a
|
(c) recombines on metal
surface to generate high temperature
|
|
(iv) Heavy water is
used in
|
(d) reducing agent
|
|
(v) Atomic hydrogen
|
(e) hydrogen and oxygen
|
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question_answer106)
Match the
items in Column I with the relevant items in Column II.
|
Column I
|
Column II
|
|
(i) Hydrogen peroxide
is used as a
|
(a) Zeolite
|
|
(ii) Used in calgon
method
|
(b) Perhydrol
|
|
(iii) Permanent
hardness of hard water is removed by
|
(c) Sodium hexametaphosphate
|
|
|
(d) Propellant
|
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question_answer107)
In
the following questions a statement of Assertion (A) followed by a statement of
Reason (R) is given. Choose the correct option out of the choices given below
each question.
(a)
If both A and R are correct and R is the correct explanation
of the A.
(b)
If both A and R are correct but R is not the correct explanation
of the A.
(c)
If A is correct but R is incorrect.
(d)
If A is incorrect but R is correct.
(A)
Permanent hardness of water is removed by treatment with washing soda.
(R)
Washing soda reacts with soluble magnesium and calcium sulphate to form
insoluble carbonates.
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question_answer108)
(A)
Some metals like platinum and palladium can be used as storage media for
hydrogen.
(R)
Platinum and palladium can adsorb large volumes of hydrogen.
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question_answer109)
Atomic
hydrogen combines with almost all elements but molecular hydrogen does not.
Explain.
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question_answer110)
How
can \[{{D}_{2}}O\] be prepared from water? Mention the physical properties in
which \[{{D}_{2}}O\] differs
from\[{{H}_{2}}O\]. Give at least three reactions of \[{{D}_{2}}O\] showing the
exchange of hydrogen with deuterium.
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question_answer111)
How
will you concentrate\[{{H}_{2}}{{O}_{2}}\] ? Show differences between structure
of \[{{H}_{2}}{{O}_{2}}\] and \[{{H}_{2}}O\] by drawing their spatial
structures. Also mention three important uses of\[{{H}_{2}}{{O}_{2}}\].
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question_answer112)
(i)
Give a method for the manufacture of \[{{H}_{2}}{{O}_{2}}\] and explain the
reactions involved therein.
(ii)
Illustrate oxidising, reducing and acidic properties of\[{{H}_{2}}{{O}_{2}}\]
with equations.
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question_answer113)
What
mass of \[{{H}_{2}}{{O}_{2}}\] will be present in 2 litres of a 1 molar solution?
Calculate the mass of oxygen which will be liberated by the decomposition of
200 mL of this solution.
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question_answer114)
A
colourless liquid ?A' contains H and O elements only. It decomposes slowly on
exposure to light. It is stabilised by mixing urea to store in the presence of
light.
(i)
Suggest possible structure of 'A?
(ii)
Write chemical equations for its decomposition reaction in light.
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question_answer115)
An
ionic hydride of an alkali metal has significant covalent character and is
almost un reactive towards oxygen and chlorine. This is used in the synthesis
of other useful hydrides. Write the formula of the hydride. Write its reaction
with\[A{{l}_{2}}C{{l}_{6}}\].
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question_answer116)
Sodium
forms a crystalline ionic solid with dihydrogen. The solid is non-volatile and
non-conducting in nature. It reacts violently with water to produce dihydrogen
gas. Write the formula of this compound and its reaction with water. What will
happen on electrolysis of the melt of this solid?
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