MODEL QUESTION PAPER CHEMISTRY

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Section A

i) Answer all questions.
ii) Each question carries 2 marks.
1. What happens when Ammonia reacts with excess of chlorine ?
2. Ferrous salts are more unstable than Ferric salts Why ?
3. Give the names and compositions of any two alloys.
4. Define the boiling point of a liquid in terms of its Vapour
pressure.
5. What is Nermst Equation ? Explain the terms.


Section – B

i) Answer any SIX of the following Questions.
ii) Each Question carries 4 marks.
11. Write the reaction of Sodium Thoisulphate with a) Iodine and
b) Silver Nitrate. Give equations.
12. Define Raoult’s Law. At 50ºC the vapour pressure of H2O is
92 mm. The vapour pressure of a solution containing 18.1 gm.
of non-volatile solute in 100 ml of water at the same
temperature is 87 mm. Find the molecular weight of the solute.
13. What is an acid base indicator ? Give two examples. Which
type of acid base titration uses methyl orange as indicator ?



Section – C

i) Answer any TWO of the following Questions.
ii) All Questions carry 8 marks each.
19. Give one method of preparation of ozone. Write two
oxidizing and two reducing properties of ozone with
equations.
20. State the Law of Mass action derive the equation for Kc of
the following reversible reaction.
a A + b B = c C + d D
Mention the relation between Kc and Kp