Q4 of 41 Page 1

A sample of water weed was placed in water and exposed to sunlight. Bubbles of a gas are seen on the surface of the leaves.
(i) Name the gas evolved.
(ii) Name the process taking place.
(iii) Write a balanced equation of reaction taking place.

(i) Oxygen
(ii) Photosynthesis
(iii) 6CO2 + 6H2O →C6H12O6 + 6O2.

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2 Why is it necessary to balance a chemical equation? 3 In the equations given below, state giving reasons, whether substances have been oxidised or reduced.
(i)  PbO + CO  →Pb + CO2 (ii) H2S + Cl2 →2HCl + S. 5 Give balanced equations, wherever possible, or where this is not possible, explain the following by means of examples:
(i) A reaction which gives out heat.
(ii) A reaction which takes place with the help of sunlight.
(iii) A reaction which is brought about by electric current.
(iv) Reversible Reactions.
(v) A reaction with a solid and gas which produces heat. 6 Balance the following chemical equations: i. ii. .