Write a note on calcium carbide

What happens when water is dropped on calcium carbide ?

Treatment of calcium carbide with water gives

What happens when water is added to calcium carbide ?

When heavy water is added to calcium carbide the compound formed is

What happens when heavy water is added to calcium carbide?

Write two uses of calcium carbonate.

Assertion : Calcium carbide on hydrolysis gives methane. Reason : Calcium carbide contains C_2^(2–) anion.