[1]
Or
Write the structures and names of the compounds formed
when compound A with molecular formula 
is
treated with 
the
presence of 
.
[2]
[2]
for
the formation of 
is
and
that of 
is 
.Is the
reduction of possible
with Al? [2]
Construct
the redox equation from the standard potential of the cell and predict if the reaction
is reactsnt favoured or product favoured.
[2]
. In
this sample what fraction of metal ions are 
ions?
What type of non-stoichiometric defect is present in this sample?
Or
Niobium crystallises in body csnered cubic structure. If
density is 8.55 
.
Calculate the atomic radius of niobium using its atomic mass 93 u. [3]
is added
to 250 g of water. 
[3]
fumes
in moist air. Explain.
(iii) In preparation of fluorine by electrolysis of 
anode
and cathode are kept separated by a diaphragm of teflon. Why?
and
on the
basis of '' crystal field splitting energy''.
(ii) Write the IUPAC name of 
(ii)
[3
+ 2]
Or
(a) Explain the following observations.
(i)
is more
acidic than 
(ii) Fluorine does not exhibit any positive oxidation
state.
(iii) Helium forms no real chemical compound.
(b) Draw the structures of the following molecules.
(i)
(ii) [3
+ 2 ]
forms
an orange red precipitate with 2, 4-DNP reagent and gives yellow precipitate on
heating with iodine in the presence of sodium hydroxide. It neither reduces
Tollen's or Fehling's reagent, nor does it decolorize bromine water or Baeyer's
reagent. On drastic oxidation with chromic acid, it gives a carboxylic acid (B)
having molecular formula 
.
Identify the compounds (A) and (5) and explain the reactions involved.
[3]
(b) Write chemical reactions to affect the following
transformations.
(i) Cyclohexene to adipic acid.
(ii) 3-bromonitrobenzene to 3-nitrobenzoic
acid. [2]
Or
(a) Write down the functional isomers of a carbonyl
compound with molecular formula 
. Which
isomer will react faster with HCN and why ? Explain the mechanism of the
reaction also. Will reaction lead to the completion with the conversion of
whole reactant into product at reaction conditions. If a strong acid is added
to the reaction mixture what will be the affect on concentration of the product
and why? [3]
(b) Arrange the following in decreasing order of their
acidic strength and give reason
for your answer.
This first order reaction was allowed to proceed at 40°C
and the data given below were collected.
|
Time (min) |
| 0.400 0.289 0.209 0.151 0.109 | 0.00 20.00 40.00 60.00 80.00 |
be
equal to 0.350 M? [3]
Or
(a) Define
(i)Order of a reaction (ii)
Elementary step in a reaction. [2]
(b) A first order reaction has a rate constant value of 0.005 
. If we
begin with 0.10 M concentration of the reactant, how much of the reactant will
remain after 3.0
hours? [3]
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