Which of the following isotopes of hydrogen has the maximum sum of $e^- + p^+ + n^0$?

Saline hydrides are known to react with water violently producing fire. Can $CO_2$,a well-known fire extinguisher,be used in this case? Explain.

Identify the correct statement from the following.

Semi-water gas is a mixture of which of the following?

Calcium cyanamide on treatment with steam under pressure gives $NH_3$ and

Which of the following is true for heavy water?