Which chemical is used in bird scarer to produce acetylene gas?

Correct option is D

Correct answer – (d) Calcium carbide reacts with water to produce acetylene gas. Acetylene produces sound and flame-like effect in bird scarers. Thus, calcium carbide is used for acetylene generation.
Information Booster / Facts Reaction: CaC₂ + 2H₂O → C₂H₂ + Ca(OH)₂. Bird scarers are used to protect crops from bird damage.
Why other options are incorrect (a) Calcium carbonate does not produce acetylene. (b) Calcium hydroxide is a product, not acetylene source. (c) Calcium oxide does not generate acetylene.