Pick out the correct option:
1 The weakest intermolecular force is present in
a) Thermoplastics
b) Fibers
c) Elastomers
d) Thermosetting plastics
2 Among the following, which is classified as neurologically active drugs?
a) Antiseptic
b) Analgesic
c) Antifertility
d) Antacids
3 The molal depression constant depends on
a) Nature of solvent
b) Nature of solute
c) Vapour pressure of solution
d) Number of particles formed in the solution
4 Which of the following solutions behave ideally?
a) Benzene and toluene
b) Ethanol and acetone
c) Carbon dis sulphide and acetone
d) Phenol and aniline
5 Artificial sweetener that has its use limited to cold food is
a) Saccharin
b) Sucralose
c) Alitame
d) Aspartame
6 To a Daniel cell, if an external voltage of 1.1V is applied
a) Electrons flow from zinc to copper and current flows from copper to zinc
b) Electrons flow from copper to zinc and current flows from zinc to copper
c) No flow of electrons or current
d) Zinc dissolves at anode and copper deposits at cathode
7 Phosgene is
a) Chloroform
b) Carbonyl chloride
c) Iodoform
d) Methylene chloride
8 Which of the following metals is obtained by leaching the ore with dilute cyanide solution?
a) Silver
b) Titanium
c) Nickel
d) Aluminium
9 The following cannot be used to prevent corrosion
a) Bisphenol
b) Tin
c) Zinc
d) Carbon steel
10 In an electrochemical cell
a) Potential energy is converted to chemical energy
b) Chemical energy is converted to potential energy
c) Chemical energy is converted into electric energy
d) Electrical energy is used to carry out a chemical reaction in the cell.
Fill in the blanks:
11 Carbon attached to four different atoms/groups is called…………
12 ------detergent has germicidal properties.
13 Purest form of iron is………
14 ------is added to raw rubber (to form crosslinks) along with other appropriate additives to form vulcanized rubber.
15 Constant boiling mixtures are termed as……..
Answer the following questions:
16 Arrange the following in order of increasing reactivity in nucleophilic substitution reaction:
CH3F, CH3I, CH3Br, CH3Cl
17 Give one advantage of H2-O2 fuel cell.
18 Draw the structure of 4-methoxy acetophenone.
19 How is KH of a gas in a liquid related to its solubility?
20 What are the main constituents of Dettol?
21 Write the reaction taking place at the anode and cathode of lead storage battery.
OR
a) What is the role of salt bridge?
b) Predict the product of electrolysis of aqueous solution of silver nitrate using silver lectrodes.
22 What are biodegradable polymers? Name the monomers of a biodegradable polyamide.
23 What is the role of
a) Sodium cyanide in the froth floatation process
b) Calcium oxide in the extraction of iron from its ore?
24 Give reason
a) Vinyl halides are inert to nucleophilic substitution reaction
b) (dl)-butan-2-ol is optically inactive
25 Convert
a) Benzene to biphenyl
b) 2-Bromopropane to 1-Bromopropane
26 a) Give a chemical test to distinguish between
2-Methylpropanol and 2-Methyl propan-2-ol.
b) Write the IUPAC name of o-cresol.
27 A solution was formed by mixing chloroform with acetone.
a) Identify the type of deviation shown by this solution? Give reason for your choice.
b) Give one characteristic of this type of solution.
OR
i) Define reverse osmosis.
ii) What happens when red blood cells are placed in 0.5% sodium chloride solution?
28 Write the structure of repeating monomeric unit of
a) Terylene
b) Neoprene
c) Teflon
29 a) What are enantiomers?
Draw the structures of the possible enantiomers of 3-Methylpent-1-ene.
b) State Saytzeff rule.
30 Write the mechanism of dehydration of ethanol at 443K.
31 Mention the action of the following on human body in bringing relief from a disease
a) Brompheniramine
b) Aspirin
c) Equanil
OR
Explain the following with an example
i. Antacids
ii. Disinfectant
iii. Narrow spectrum antibiotics
32 Explain
a) Mond’s process
b) Zone refining
c) Column chromatography for purification of rare elements.
33 How many mL of 0.1M HCl is required to react completely with 1g mixture of sodium carbonate and sodium hydrogen carbonate containing equimolar amounts of the two?
OR
Calculate the mass of a non-volatile solute (molar mass 40g/mol) which should be dissolved in 114g octane (molar mass 114 g/mol) to reduce the vapour pressure to 80%.
Please click on below link to download CBSE Class 12 Chemistry Sample Paper 2021 Set A
