Q.7 Which of the following is not a greenhouse gas?
(a) Carbon dioxide
(b) Sulphur dioxide
(c) Methane
(d) Nitrogen

(d) Nitrogen is not a greenhouse gas.

EXPLANATION

Carbondioxide is the major greenhouse gas. It traps large amount of heat and thus warms the Earth's atmospheric surface. Methane is also a greenhouse gas and its presence in the atmosphere, affects the Earth's temperature and climate system. Sulphur dioxide is not a direct greenhouse gas like carbon dioxide or methane, but it is considered as an indirect greenhouse gas.