Question

4. The fuel obtained by decomposing sludge is
(a) carbon monoxide
(c) kerosene
(b) biogas
(d) petrol​

Answer 1

Answer:

biogas. .......................

The gas obtained by decomposing sludge is methane and carbon dioxide. Decomposition of sludge produces methane and carbon dioxide which is then stored and supplied as biogas for various household processes and other commercial process.

Answer 2

(a) carbon monoxide

Explanation:

https://goo.gl/search/Carbon+monoxide

Carbon monoxide,