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question_answer1) What is the inert pair effect?
question_answer2) A nitrogen atom possesses 5 valence electrons but it does not form Give the reason.
question_answer3) On being slowly passed through water, form bubble but dissolves. Why is it so?
question_answer4) Write the structure of pyrophosphoric acid.
question_answer5) What is the state of hybridisation of N in ion?
question_answer6) In trimethyl amine the nitrogen has a pyramidal structur whereas in trisilylamine it has a planar geometry
question_answer7) Why is not particularly reactive?
question_answer8) Give reason : The maximum number of covalent bonds formed by nitrogen is 4.
question_answer9) What is the difference between the bonds present in and molecules?
question_answer10) Mention one property of hydrazine.
question_answer11) Why is a good complexing agent?
question_answer12) readily forms dimer. Explain.
question_answer13) Give three oxo - acids of nitrogen. Write down the oxidation state of nitrogen in each of them?
question_answer14) Why is nitrogen a gas whereas phosphorus is solid?
question_answer15) is liquid while is gas at room temperature. Give reason.
question_answer16) Which has the large bond angle or
question_answer17) Explain why tendency to show - 2 oxidation state diminishes from sulphur to polonium?
question_answer18) Why does oxygen not show an oxidation state of + 4 and + 6 like sulphur?
question_answer19) Write two uses of elemental selenium.
question_answer20) How is bonding in different?
question_answer21) Write an example of neutral molecule which is iso - electronic with
question_answer22) What are allotropes of sulphur?
question_answer23) Explain why oxygen is a gas while sulphur is a solid?
question_answer24) What is the shape of molecule?
question_answer25) Sulphur disappears when boiled with sodium sulphite. Why?
question_answer26) Which of the three is the strongest oxidising agent :
question_answer27) Why is HF weakest acid among hydrohalo acids in spite of the fact that fluorine is most electronegative?
question_answer28) Give an example of compound in which chlorine is in + 7 oxidation state.
question_answer29) In inter halogen compounds of the type AB, and AB r is invariably fluorine. Why?
question_answer30) What is freon?
question_answer31) What are halogens, why are they called so?
question_answer32) Which halogen is radioactive?
question_answer33) Why is bond dissociation energy ofF^ smaller than
question_answer34) Why is more soluble in KI than in water?
question_answer35) Name the oxide of chlorine used in paper pulp?
question_answer36) Why is covalent bonding of halogen always sigma bonding?
question_answer37) Among halogen hydrides which has maximum ionic character?
question_answer38) Why is HF not stored in glass bottles?
question_answer39) What happens when is hydrolysed?
question_answer40) Which compound led to the discovery of compounds of noble gas.
question_answer41) Name the geometry of and
question_answer42) What are clathrate compounds of noble gas?
question_answer43) Noble gases have largest radii. Explain.
question_answer44) Why He is used in inflating aeroplane tyres?
question_answer45) Xe forms compound but Kr doesn't why?
question_answer46) Why do noble gases exist as monoatomic species?
question_answer47) Why is weaker base than
question_answer48) Explain why phosphorus forms while nitrogen does not form
question_answer49) is planar but pyramidal, why?
question_answer50) Arrange in increasing ionic character. Give reason.
question_answer51) Complete the reactions : (i) (ii) (iii)
question_answer52) Why is diprotic?
question_answer53) Why does nitrogen show anomalous behaviour?
question_answer54) Acidity of oxoacids of nitrogen increases with increase in oxidation state, why?
question_answer55) Why all the bonds of molecule are not equivalent?
question_answer56) Explain the hybridisation of molecule. What is the shape of this molecule?
question_answer57) Arrange the following in increasing order of boiling points
question_answer58) Arrange the following in decreasing order of property indicated. (i)(Acidic character) (ii) (bond energy) (iii)(ionic character of the bond) (iv)(base strength)
question_answer59) Give reason why + 5 oxidation state of Bi is less stable than + 3 state?
question_answer60) Why are halogens coloured? Explain.
question_answer61) Arrange halogens in increasing order of electron affinity.
question_answer62) Why does fluorine show abnormal behaviour?
question_answer63) Special methods are used to prepare HBr and HI why?
question_answer64) Arrange hydrogen halides in increasing order of (i) thermal stability (ii) reducing power (iii) boiling point and (iv) acidic character.
question_answer65) Write the chemistry of etching of glass.
question_answer66) Why are inter halogen compounds more reactive than its elemental form?
question_answer67) Compare giving reason why fluorine is stronger oxidizing agent than chlorine?
question_answer68) Write the chemical reaction to show the formation of from bleaching powder?
question_answer69) Complete the reactions : (i)(ii) (iii) (iv)
question_answer70) Give the structure of
question_answer71) How is prepared? Give chemical reaction.
question_answer72) What prompted Bartlett to discover noble gas compounds?
question_answer73) Give two uses of noble gases.
question_answer74) Account for the following : has higher bond dissociation energy than NO.
question_answer75) Give a comparative account of chemistry of hydride (stability and basic character) and halides of N and P.
question_answer76) Arrange the following in order of the property mentioned. (i)(increasing basic strength) (ii)(increasing ionic character) (iii)increasing oxidising power.
question_answer77) Which halogen : (i) Forms H - bonding (ii) Forms strongest acid (iii) Has largest atom (iv) Has highest ionisation enthalpy (v) Shows some metallic properties (vi) Has highest electron affinity.
question_answer78) Arrange the hydride of halogen family in increasing order of (i) ionic character (ii) bond length (iii) thermal stability (iv) dipole moment, (v) boiling point.
question_answer79) Complete the reaction : (i)(cold & dil.) (ii)(hot & conc.) (iii)(Hot)
question_answer80) Discuses two similar and two dissimilar properties of nitrogen and phosphorus?
question_answer81) Write balanced equation of following reaction (i) (ii)
question_answer82) Why HF is a weaker acid than HI?
question_answer83) Account for the following : (i) has higher boiling point than (ii) is a diprotic acid. (iii) is called oxygen difluoride and not fluorine oxide why?
question_answer84) 38. (i) is coloured but is colourless. (ii)
question_answer85) State the trend obeserved in case of the following : (i) Oxidising power of members of halogen family. (ii) Basic character of hydrides of elements of group - 15 (iii) What happens when phosphorus is boiled with caustic alkali?
question_answer86) (i) Tendency to show - 2 oxidation state diminishes from sulphur to polonium in group 16. Why? (ii) Only higher members of group - 18 of the periodic table are expected to form compounds. (iii) readily form a dimer whereas does not.
question_answer87) (i) Write the structural formula for or (ii) Write chemical reaction to show is an oxidizing agent.
question_answer88) Account for the following (i) is more basic than PH^ (ii) has higher boiling point than (iii) is a fairly inert gas
question_answer89) Compare and contrast the following : (i) Structure of oxides of nitrogen and phosphorus (ii) Electron affinity of fluorine and chlorine (iii) Maximum covalency of oxygen and sulphur. (a) What are inter halogen compounds and why are they more reactive than corresponding molecular halogen? (b) Present comparative account of each of the following. (i) Acidic properties of HF and (ii) Basic properties of and
question_answer90) Present a comparative account of each of the following (i) Proton affinity of and (ii) Physical state of nitrogen and phosphorus (iii) Shapes of and (iv) Oxidising power of and (v) Bond angles of and (vi) Nitrogen forms larger number of oxides than phosphorus.
question_answer91) Draw the structure of the following and mention the hybridization of (i) (ii) Peroxomonosulphuric acid (iii) (iv)
question_answer92) Explain the following : (i) Nitrogen exists as diatomic molecule where a phosphorus exists as tetra atomic molecule (i) is known but is not known.
question_answer93) Explain the following : (i) is an exothermic compound but is an endothermic compound. (ii) Nitrogen does not form pent chloride like phosphorus.
question_answer94) Describe the properties of O, S, Se, Te and Po with reference to (i) metallic properties (ii) catenation (iii) thermal stability of hydrides (iv) oxidation states (v) allotropy.
question_answer95) (a) Complete and balance the following equation (i) (ii) (iii) (iv) (v) (vi) (b) Arrange the following in increasing order of basicity.
question_answer96) Account for the following : (i)in aqueous solution is stronger acid than (ii) Noble gases have low chemical reactivity.
question_answer97) (a) Which of these is regarded as weak acid and why? (b) Give two compounds of halogens in which the halogen displays different positive oxidation states.
question_answer98) (a) Why should binary compounds of oxygen and fluorine be called oxygen fluoride and not fluorine oxides. (b) State any four properties which make oxygen different from the rest of the elements of the same group (c) Give a reason for anomalous behaviour of oxygen.
question_answer99) Describe briefly the properties of group-17 elements (halogen family). State two examples of the compounds in which halogen display positive oxidation states.
question_answer100) Discuss briefly the trends properties of the group-16 elements (oxygen family). Define catenation and illustrate it with an example.
question_answer101) Discuss briefly the trends in chemical property group-15 (nitrogen family). Why does nitrogen show anomalous behaviour as compared to other member of this group.
question_answer102) (a) The first element in every group of represents elements show properties different from the characteristic properties of the group. Name three such elements mention two abnormal properties of each of them. (b) Draw the structure of (i) and
question_answer103) Give reasons : (i) HF is stored in wax coated bottles (ii) Nitric acid becomes yellow on long standing
question_answer104) is greenish yellow gas with an offensive smell used water purification. It partially dissolves in water to give a solution which turns blue litmus red. When A, is passed through Na Br, Br, is obtained. (a) Identify (b) Name the group to which it belongs. (c) Write general electronic configuration of elements of this group. (d) Write chemical equations when X^ reacts with (e) What happens when X» reacts with hot and cone. ? Give equation.
question_answer105) Explain the following (i) The first ionization energy of nitrogen is greater than oxygen. (ii) Sulphur vapours exhibit some par magnetism. (iii) Of the noble gases only xenon is known to form real chemical compounds. (iv) Nitrogen shows a very little catenation tendency whereas phosphorus shows a clear tendency for catenation.
question_answer106) Explain the following : (i) Most of the known noble gas compounds are those of xenon. (ii) exists but does not. (iii) Among the hydrides of elements of group - 16 water shows unusual physical properties.
question_answer107) (i) Sulphur exhibits tendency for catenation but oxygen does not. (ii) The electron affinity of fluorine is less than that of chlorine. (iii) All the bonds in are not equivalent. (iv) Fluorine is the strongest oxidant amongst the halogens.
question_answer108) Describe the steps involved in the contact process for the manufacture of sulphuric acid. (b) Predict the probable structure of on the basis of VSEPR theory (c) is not easily hydrolysed though thermo-dynamically it should be : Why? (d) Draw the structure of (i) (ii)
question_answer109) (i) Draw the structure of (i) (ii) (ii) White phosphorus is much more reactive than red phosphorus. (iii) Bleaching of flowers by is permanent while by is temporary. (iv) Nitric oxide becomes brown when released in air. (v) is ionic in solid state. (vi) Ammonia is a good complexing agent
question_answer110) (i) Metal fluorides are more ionic in nature than metal chlorides. Explain. (ii) In group 15 the bond angle H - M - H decreases in the following order
question_answer111) Why is \[{{H}_{2}}S\] less acidic than \[{{H}_{2}}Te\]?
question_answer112) Oxygen molecule has the formula \[{{O}_{2}}\] while sulphur is \[{{S}_{8}}\]why?
question_answer113) Explain why both N and Bi do not form pentahalides while phosphorus does.
question_answer114) Give reasons for the following: (a) \[C{{N}^{-}}\]ion is known but \[C{{P}^{-}}\] ion is not known (b) \[N{{O}_{2}}\]dimerises to form \[{{N}_{2}}{{O}_{4}}\] (c) \[lCl\] is more reactive than \[{{I}_{2}}\].
question_answer115) On addition of ozone gas to KI solution, violet vapours are obtained. Why?
question_answer116) Chlorine water has both oxidizing as well as bleaching properties? Explain.
question_answer117) \[{{H}_{3}}P{{O}_{2}}\]and\[{{H}_{3}}P{{O}_{3}}\]act as good reducing agents while \[{{H}_{3}}P{{O}_{4}}\] does not. Discuss.
question_answer118) Why does nitric oxide become brown when released in air?
question_answer119) There is a small increase in atomic radius is moving from P to As in group 15 elements as compared to large increase in atomic radius in moving from N to P in the same group. Explain.
question_answer120) Sulphur disappears when boiled with aqueous solution of sodium sulphite. Assign reason.
question_answer121) Ammonia acts as a ligand. Discuss.
question_answer122) Why is neon used in illuminating warning signal. Why?
question_answer123) Xenon does not form fluorides such as \[Xe{{F}_{3}}\]and \[Xe{{F}_{5}}\]. Explain.
question_answer124) Ammonia has a higher proton affinity than phosphine. Discuss.
question_answer125) Oxides of phosphorus have cage like and not open structures. Explain.
question_answer126) The experimentally determined N-F bond length in \[N{{F}_{3}}\] is greater than the sum of the covalent radii of N and F. Assign reason.
question_answer127) Helium and neon do not form compounds with fluorine. Assign reason.
question_answer128) Noble gas elements form compounds only with fluorine and oxygen. Explain.
question_answer129) The group of noble gas elements is called zero group. Why?
question_answer130) Fluorine does not show variable oxidation states while other members of the halogen family exhibit variable oxidation states. Why?
question_answer131) Bond dissociation enthalpy of \[F-F\] bond is less than that of \[\text{C}l\,\text{-}\,\text{C}l\]bond. Explain.
question_answer132) Ferric iodide is very unstable but ferric chloride is stable. Explain.
question_answer133) \[KH{{F}_{2}}\]is a well known compound whereas \[KHC{{l}_{2}}\] does not exist. Why?
question_answer134) HF is not stored in glass bottles but is kept in wax bottles. Assign reason.
question_answer135) Lithium fluoride (LiF) is mainly ionic but lithium iodide (Lil) is covalent in nature. Assign reason.
question_answer136) Inter halogen compounds are more reactive than halogens. Why?
question_answer137) \[Cl{{F}_{3}}\] exists but \[FC{{l}_{3}}\] does not. Why?
question_answer138) \[P{{F}_{5}}\] is known but \[N{{F}_{5}}\] is not known. Discuss.
question_answer139) Molecular nitrogen is very inert chemically. Why?
question_answer140) Iodine is liberated in the reaction between \[KI\] and \[C{{u}^{2+}}\] ions but chlorine is not liberated when \[KCl\]is added to\[C{{u}^{2+}}\] ions. Explain.
question_answer141) Hydrogen sulphide cannot be dried by passing through cone. \[{{H}_{2}}S{{O}_{4}}\] . Why?
question_answer142) \[{{H}_{2}}S\]is a stronger acid than \[{{H}_{2}}O,\] Explain.
question_answer143) Sulphur vapours exhibit some paramagnetic behaviour. Explain.
question_answer144) \[S{{F}_{6}}\] is not easily hydrolysed whereas \[S{{F}_{4}}\] is easily hydrolysed. Assign reason.
question_answer145) Why is iodine more soluble in KI solution than in water?
question_answer146) Sulphur dioxide is a more powerful reducing agent in the alkaline medium than in the acidic medium. Assign reason.
question_answer147) Bond angle in \[{{H}_{2}}S\] is lower than in \[{{H}_{2}}O\]. Justify.
question_answer148) \[{{H}_{2}}O\]is a liquid while \[{{H}_{2}}S\] is a gas at room temperature. Explain.
question_answer149) Oxygen does not show oxidation states of + 4 and + 6 like sulphur. Explain.
question_answer150) \[S{{F}_{6}}\]is a well known compound while \[S{{H}_{6}}\] does not exist. Explain
question_answer151) Compounds of fluorine and oxygen are called fluorides and not oxides. Assign reason.
question_answer152) \[{{H}_{2}}S,\]acts only as reducing agent while \[S{{O}_{2}}\] can act both as a reducing agent and as an oxidizing agent. How will you account for it?
question_answer153) Sulphur dioxide acts as bleaching agent in the presence of moisture. Discuss.
question_answer154) Sulphur is a solid while oxygen is a gas at room temperature Why?
question_answer155) Phosphorus acid can act both as oxidising agent as well as reducing agent while phosphoric acid is only an oxidising agent. Explain.
question_answer156) Zinc reacts with dilute \[{{H}_{2}}S{{O}_{4}}\] to give \[{{H}_{2}}\]. It also reacts with cone. \[{{H}_{2}}S{{O}_{4}}\]to give \[S{{O}_{2}}\]. How will you account for this difference?
question_answer157) On heating, \[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\] gives rise to a gas which on treatment with Mg ribbon gives a white solid. On dissolving white solid in water another gas (X) is evolved. It gives white fumes when a rod dipped in cone. HCl is brought in its contact. Identify the gas X.
question_answer158) Boiling point of phosphine is lesser than that of ammonia though its molecular size is more. Assign reason. Therefore, boiling point of ammonia is more than that of phosphine.
question_answer159) All bonds in the molecule of \[PC{{l}_{5}}\] are not equivalent. Explain.
question_answer160) \[PC{{l}_{5}}\]acts as a chlorinating agent in organic reactions. Why?
question_answer161) Nitrogen and chlorine have same electro negativity \[(3\cdot 0)\]. Molecular nitrogen is inert at room temperature while chlorine is highly reactive. How will you account for it?
question_answer162) \[{{H}_{3}}P{{O}_{3}}\]is a diprotic acid. Justify.
question_answer163) \[N{{F}_{3}}\]and\[N{{H}_{3}}\] are both pyramidal but differ widely in dipole moment values. Assign reason.
question_answer164) \[N{{F}_{3}}\]is not hydrolysed while \[NC{{l}_{3}}\] can be readily hydrolysed. Explain.
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