1.

Anaerobic bacteria digest animal wastes and produces biogas (change=A) . The biogas is then burnt as fuel (change=B) . The following stamens pretain to these changes . Choose the correct one : (a) A is a chemical change (b) B is a chemical change (c) A and B are chemical changes. (d) A and B are physical changes.

Answer»

Anaerobic bacteria digest animal wastes and produces biogas (change=A) . The biogas is then burnt as fuel (change=B) . The following stamens pretain to these changes . Choose the correct one :

(a) A is a chemical change (b) B is a chemical change

(c) A and B are chemical changes.

(d) A and B are physical changes.



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