JAC Class 12 Chemistry Question Paper 2018 with Solution

About this paper

This is the Jharkhand Academic Council (JAC) Class 12 Chemistry paper from the 2018 board examination, with an answer under each question. The instructions set it at 70 marks and 34 questions: eight multiple-choice and seven very short questions of one mark, eight Short Answer I questions of two marks, eight Short Answer II questions of three marks, and three long answers of five marks. The long answers are an ethylene-glycol antifreeze calculation, the laboratory preparation of phosphine, and notes on the carbylamine, Hofmann bromamide and Gattermann reactions, each with an Or alternative. A three-mark question asks for the products of reactions of xenon fluorides. Time is not printed.

Exam

JAC Class 12

Subject

Chemistry

Year

2018

Maximum marks

70

Questions

34

Pages

5

Answers included

Yes

Paper pattern

• Multiple Choice Type Questions

  8 marks

  Questions 1–8, one mark each

• Very Short Answer Type Questions

  7 marks

  Questions 9–15, one mark each

• Short Answer Type-I

  16 marks

  Questions 16–23, two marks each

• Short Answer Type-II

  24 marks

  Questions 24–31, three marks each

• Long Answer Type

  15 marks

  Questions 32–34, five marks each, each with an Or alternative

Topics covered

• Solid state
• Solutions
• Electrochemistry
• Chemical kinetics
• Surface chemistry
• General principles of isolation of metals
• p-Block elements
• d- and f-block elements
• Coordination compounds
• Haloalkanes, alcohols and amines
• Biomolecules
• Polymers and chemistry in everyday life

Questions from this paper

1. Why does NH₃ form hydrogen bonds while PH₃ does not?
2. Predict which of Cu⁺ and Fe³⁺ will be coloured in aqueous solution, and give a reason for each.
3. What is a salt bridge? Mention its functions.
4. An antifreeze solution is prepared from 222.6 g of ethylene glycol, C₂H₆O₂, and 200 g of water. Calculate its molality. If the density of the solution is 1.072 g mL⁻¹, what is its molarity?
5. How is phosphine prepared in the laboratory, and how does it react with CuSO₄ and with HgCl₂?
6. Write short notes on the carbylamine reaction, Hofmann's bromamide reaction and the Gattermann reaction.