CBSE Class 12 Chemistry Question Paper 2021 Set 02 Solved

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Previous Year Question Papers for Class 12 Chemistry

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Section -A
 
1. Write the structure of the amide which gives propanamine by Hoffmann bromamide reaction. 
 
2. Define the term agonists. 
 
3. The dissolution of ammonium chloride in water is an exothermic process, but still it dissolves in water readily. Why?
OR
Addition of mercuric iodide to an aqueous solution of KI shows increase in vapour pressure. Why?
 
4. How much charge in Faradays is required for the reduction of 1 mol of Al3+ to Al.
OR
The products of electrolysis of aqueous NaCl at the respective electrodes are :
Cathode : H2 ,Anode : Cl2 and not O2. Explain.
 
5. Which compound in each of the following pair will react faster in SN1 reaction?
CH3CH=CHCl or CH2=CHCH2Cl
 
Section -B
 
6. a) Write the IUPAC name of the following
CH3CH(CHO)CH2CH=CH2
b) Draw the structure of 4-methoxy,N,N,dimethylaniline.
7. How do we separate two sulphide ores by froth floatation process? Explain with an example. 2
8. Explain the following
a) Peptide linkage
b) Pyranose structure of α- D (+)glucose
 
9. a) The specific rate of a reaction is 6.2x10-3molL-1s-1.what is the order of the reaction.
b) For a reaction 2A→products, change in pressure of A is 4.8 bar in 20 minutes. What will be the average rate of this reaction.
 
10. a) Give a chemical test to distinguish aniline and N-methyl aniline.
b) Arrange the following in decreasing order of pKb values :
C2H5NH2, C6H5NHCH3, (C2H5)2NH and C6H5NH2
OR
Write the structures of main products when benzene diazonium chloride reacts with the following reagents
a) H3PO2 +H2O
b) CuCN/KCN
 
11. Write short note on
a) Zaitsev rule
b) Racemisation
OR
Explain the following with example
a) Wurtz Fittig reaction
b) Freons
 
12. What is the difference between Homopolymers and Copolymers. Give one example of each type 2
 
Section - C
 
13. The density of lead is 11.35 g/cm3and the metal crystallizes with fcc unit cell. Estimate the radius of lead atom. Atomic mass of lead =207g/mol)
 
14. a) Give the significance of lattice points.
b) Explain why
(i) Amorphous solids are isotropic.
(ii) Ferrimagnetic substances show better magnetism than antiferromagnetic substances.
 
15. The freezing point of a solution containing 0.3 g of acetic acid in 30 g benzene is lowered by 0.450C. Calculate Van’t Hoff factor .(Kf for benzene = 5.12 K kg mol-1)
OR
The vapour pressures of pure liquids A and B are 450 and 750 mm of Hg at 350 K respectively. Find out the composition of the liquid mixture if total vapour pressure is 600 mm of Hg. Also find the composition of the vapours of these liquids in vapour phase.
 
16. Explain the role of
a) Lime stone in the extraction of iron
b) CO in the purification of nickel
c) SiO2 in the extraction of copper
 
17. a) What are azeotropes?
b) What type of deviation is shown by a mixture of ethanol and acetone? Give reason
c) Gas (A) is more soluble than gas (B)at the same temperature.Which of the two gases will have higher value of KH and why?
 
18. a) Pick out the odd one from the following on the basis of their medicinal properties mentioning the reason:
Luminal, Seconal, Phenacetin, Equanil.
b) Give an example of a substance that can act as a disinfectant as well as antiseptic depending upon its concentration. (Specify concentration)
c) Name any two macromolecules chosen as drug targets.
OR
Classify the following drugs and give their functions
a) Terfenadine
b) Iproniazid
c) Ofloxacin
 
19. Suggest a mechanism for the dehydration of ethanol using conc.H2SO4 at 413K.
OR
Give reason for the following observations
a) Phenol is less acidic than 2-Fluoro phenol
b) Tert-butanol is more volatile than n-butanol
c) Di-tert-butyl ether cannot be prepared by Wiliamsons synthesis
 
20. Account for the following :
a) Aromatic amines are less basic than aliphatic amines
b) Acetylation of aniline reduces its activation effect
c) Nitration of aniline gives substantial amount of m-nitro aniline
 
21. Write Short note on
a) Glycosidic linkage
b) Anomers
c) Oligosaccharides
 
22. Write the name and structures of the monomers of
a) Buna N
b) Teflon
c) Dacron
OR
a) What is meant by biodegradable polymers?
b) A biodegradable polymer is used in speciality packaging, orthopaedic devices and in controlled release of drugs. Identify the polymer and give its structure
 
23. Write equations for the following name reactions:
a) Gattermann - Koch reaction.
b) Stephen reaction.
c) Hell Volhard Zelinsky reaction
 
24. What happens when
a) Chlorobenzene is subjected to hydrolysis
b) Propene is treated with Cl2 in the presence of U.V. light / heated.
c) Alkyl chlorides when treated with NaI in dry acetone


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