Download This Question paper consists of two parts

SUB: CHEMISTRY
Max Marks: 70
[Answer all questions in Part - I. Part - II has three sections (Sec - A, B & C). Choose two
questions from each Section]
PART - I [20 Marks]
Question 1
I.
a.
b.
c.
d.
e.
Fill in the blanks choosing words from the following:
[5]
(Primary, secondary, tertiary, salt hydrolysis, common ion effect, increases,
decreases, Kohlrausch law, specific, molar, equivalent, piezoelectricity)
Carbylamines test is used for the test of __________ amines.
A solution of copper sulphate is acidic in nature due to __________.
Some polar crystals on heating produce electricity. This phenomenon is called
__________.
The ˄° of weak electrolyte is called __________ conductance.
As the concentration of an electrolyte increases, its __________ conductance
increases but __________ conductance decreases.
II.
Match the following:
a.
b.
c.
d.
e.
Mix of HCl + water
Wilkinson’s Catalyst
Urea
Picric acid
Grahite
[5]
Organometallic Compounds
2, 4, 6 trinitro phenol
Conductor
Biuret test
Azeotropic Mixture
III. Choose the correct answer:
[5]
a.
Which of the following is a colligative property?
i.
Surface Tension
iii. Osmotic pressure
ii.
Optical rotation
iv. Viscosity
b.
Carborundum is the commercial name of:
i.
Al2O3
ii.
Ca(CN)2
iii.
The rate constant of a reaction depend on:
i.
Initial conc. of the reaction
iii.
ii.
Time of reaction
iv.
Temperature
Extent of reaction
Intermolecular H – bonding is strongest in:
i.
Methyl amine
iii.
ii.
Methanol
iv.
Phenol
Formaldehyde
Oxidation state of +1 for P is found in:
i.
H3PO3
ii.
H3PO4
H3PO2
c.
d.
e.
iii.
SiC
iv.
iv.
CaC2
H4P2O7
IV.
Correct the following statements:
[5]
a.
b.
c.
d.
e.
The hydridization state of oxygen in water molecule is sp2.
Order and Moleculatiry of a reaction can be zero.
The formation of nitrobenzene is SN1 reaction.
The solution of Na2CO3 is neutral in nature.
When a system undergoes a transformation, the entropy of the system increases.
PART - II [50 Marks]
SECTION - A [Attempt any two questions]
[20 Marks]
Question 2
a.
b.
c.
What is Hydrogen ion concentration of 0.1N CH3COOH solution? The ionization
constant of CH3COOH is 1.5x10-5. What is pH of solution?
[4]
-5
The solubility of Ag2CrO4 is 5x10 . What is the solubility product of salt? [4]
What is the shape of acetylene molecule? Mention type of hybridization in it. [2]
Question 3
a.
b.
c.
The solubility product of lead bromide is 8x10-5. If the salt is 80% dissociated in
saturated solution, find the solubility of salt.
[4]
Calculate the equilibrium constant for the following reaction:
Fe + CuSO4
FeSO4 + Cu
at 25°C.
2+
(Given:
E°(Fe/Fe ) = 0.44V and E°Cu/Cu2+ = -0.337V)
[3]
2.8g of N2 gas at 300K and 20 atm was allowed to expand isothermally against a
constant external pressure of 1 atm. Calculate ΔE, q and W for the gas.
[3]
Question 4
a.
b.
c.
Enthalpy change and entropy change of a chemical reaction at 25°C are 177.0 KJ
and 160.4 JK-1 respectively. Calculate the free energy change for the reaction and
predict whether the reaction is spontaneous or non-spontaneous.
[3]
i.
Explain why dissociation of H2S gas in acidic medium suppressed.
ii.
Type of indicator suitable for following titrations:
ii.
NaOH Vs CH3COOH
[3]
i.
NaOH Vs H2SO4
The data below are for the reaction of NO and Cl2 from NOCl at 295k.
Conc. Of Cl2
0.05
0.15
0.05
i.
ii.
Conc. Of NO
0.05
0.05
0.15
Initial Rate
1.0 x 10-3
3.0 x 10-3
9 x 10-3
What is the order w.r.t. NO and Cl2 in the reaction?
Calculate rate constant.
SECTION - B [Attempt any two questions]
[4]
[10 Marks]
Question 5
a.
b.
Using IUPAC system name following co-ordination compounds:
i.
[Pt Cl2(NH3)2]
iii. [CoCl (ONO)(en)2]+
3+
ii.
[(H2O)5 Fe – OH – Fe(H2O)5]
What is the oxidation state of central metal in the following carbonyls?
i.
Fe(CO)5
ii.
Mn2(CO)10
[3]
[2]
Question 6
a.
b.
Explain why ClF3 exists whereas FCl3 does not?
Write balanced equation for the following reactions:
i.
Zinc reacts with Concentrated Nitric acid.
ii.
Copper reacts with Conc. Sulphuric acid.
iii. Copper reacts with moist air in presence of CO2.
[2]
[3]
Question 7
a.
Out of Co2+ and Zn2+ salts, which is attracted in a magnetic field? Explain with
reason.
[2]
b.
What happens when?
i.
Sodium thiosulphate reacts with AgNO3 solution.
ii.
Fluorine reacts with water at very low temperature.
[3]
SECTION - C [Attempt any two questions]
[20 Marks]
Question 8
a.
b.
c.
Give the name of the monomers of following polymers:
i.
Bakelite
ii.
Teflon
How can you convert the following?
i.
Formic acid to oxalic acid
iii.
[3]
Dacron
[3]
ii.
Methyl amine to Ethyl amine
Write fully balanced equation for the following name reactions:
i.
Haloform reaction
iii. Aldol condensation
ii.
Rosenmund’s reduction
iv. Cannizaro’s reaction
[4]
Question 9
a.
Write the name and structure of three isomers which have same molecular
formula C3H8O.
[6]
b.
Name the type of isomerism exhibited by following pair of compounds:
i.
Maleic acid and fumaric acid
ii.
1-Butene and 2-Butene
iii. Acetaldehyde and Vinyl alcohol
iv. Diethyl ether and methyl propyl ether
[4]
Question 10
Give reason for following:
a.
b.
c.
d.
e.
[10]
Nitrobenzene doesn’t undergo Friedel Craft’s reaction.
Phenol is acidic but ethanol is not.
Toluene is more easily nitrated than benzene
Acetaldehyde doesn’t give Cannizaro’s reaction but formaldehyde and benzene
does.
Carboxylic acids don’t give characteristic tests of carbonyl compounds.
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