Duration: 1 hour
Section A: Each Question Carries 1 Mark
Question 1: How many number of g-atom of oxygen are present in 6.02 x 1024 CO molecules?
Question 2: According to Le Chatelier’s principle, what is the effect of addition of heat to equilibrium between solid and liquid?
Question 3: What is a standard solution?
Section B: Each Question Carries 2 Mark
Question 1: 1. Write major difference between metals and non-metals?
Question 2: What is the shape of 3s orbital? How many nodes are there in it?
Question 3: Reaction between H2 and Cl2 is slow but reaction between NaCI and AgNO3 is very fast. Explain.
Section C: Each Question Carries 3 Mark
Question 1: Explain the hybridisation of 4SF?
Question 2: Why is green chemistry considered as a new route to protection of environment?
Section D: Each Question Carries 4 Mark
Question 1: Answer the following:
(a) State the postulates of kinetic molecular theory of gases.
(b) Out of dry air and wet air, which is heavier? Explain.
Question 2: Give Reasons:
(i) Noble gases have comparatively large atomic sizes.
(ii) Halogens are coloured.
(iii) NH3 forms hydrogen bond but PH3 does not.