Question

Hydrogen reacts with calcium to form calcium hydroxide.

• A. True
• B. False

Answer 1

The correct option is B False

• Metals do not generally react with hydrogen under normal conditions.
• At high temperatures, highly reactive metals (sodium, potassium, calcium, etc) react with hydrogen to form corresponding metal hydride.

The reaction between calcium and hydrogen is as follows:

$\underset{\mathrm{calcium}}{\mathrm{Ca}\left(\mathrm{s}\right)}+\underset{\mathrm{hydrogen}}{{\mathrm{H}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{calcium}\mathrm{hydride}}{{\mathrm{CaH}}_2\left(\mathrm{s}\right)}$

Thus the given statement is false., i.e., when calcium reacts with hydrogen, the product formed is calcium hydride but not calcium hydroxide.