Question

What are the main constituents of biogas? (a) methane and sulphur dioxide (b) methane and carbon dioxide (c) methane, hydrogen and nitric oxide (d) methane and nitric oxide?

Answer 1

methane and carbon dioxide is the main constituent of biogas.

Answer 2

(c) $\huge\mathcal\blue{Methane}$

$\large\bf\red{Explanation✓}$

Methane gas is the main product of biogas. Around 70% of the gas produced is methane and remaining will be ammonia, carbon-di-oxide.