JAC Class 12 Chemistry Question Paper 2013 with Solution

About this paper

This is the Jharkhand Academic Council (JAC) Class 12 Chemistry paper from the 2013 board examination, with answers and worked steps under each question. It has four questions: Question 1 has eight multiple-choice items, Question 2 has ten short parts, Question 3 has nine parts and Question 4 has three longer parts with several sub-questions. Physical chemistry includes Raoult's law, first-order and pseudo-unimolecular reactions, an isotonic-solution molar-mass problem and a Faraday's-law calculation of copper deposited by 2 A in 60 minutes. The inorganic and organic parts cover the aluminothermic process, the chromyl chloride test, the contact process, IUPAC names of complexes, iodoform, amines, polymers and food preservatives. Marks and time are not printed.

Exam

JAC Class 12

Subject

Chemistry

Year

2013

Pages

4

Answers included

Yes

Paper pattern

• Question 1

  Eight multiple-choice parts, (i) to (viii)

• Question 2

  Ten short-answer parts, (i) to (x)

• Question 3

  Nine short-answer parts, (i) to (ix)

• Question 4

  Three longer parts on electrolysis, ammonia and reactions of carbonyl compounds and acids

Topics covered

• Solid state
• Solutions and colligative properties
• Electrochemistry
• Chemical kinetics
• Surface chemistry and colloids
• General principles of isolation of elements
• p-Block elements
• d- and f-block elements
• Coordination compounds
• Alcohols, phenols and haloalkanes
• Aldehydes, ketones, carboxylic acids and amines
• Biomolecules, polymers and food preservatives

Questions from this paper

1. A 5% urea solution is isotonic with a 12.5% solution of an organic compound. If the molecular mass of urea is 60, calculate the molecular mass of the organic compound.
2. What do you mean by a first-order reaction and a pseudo-unimolecular reaction?
3. Write about the aluminothermic process with two examples.
4. What happens when acidified KMnO₄ solution reacts with H₂S and with SO₂?
5. How much copper will be deposited at the cathode of an electrolytic cell containing Cu²⁺ ions by passing a current of 2 amperes for 60 minutes?
6. What do you mean by food preservatives? Give the names of any two food preservatives.