Although ${\mathrm{D}}_2\mathrm{O}$ resembles with ${\mathrm{H}}_2\mathrm{O}$ chemically yet it is a toxic substance. Explain

Can sodium bicarbonate make water hard?

Account for the following:

Ionic hydrides are non-conductor of electricity in solid state.

Account for the following:

Electron rich hydrides behaves as Lewis bases.

Account for the following:

Complete the following reaction (write balanced equation).

${\mathrm{Fe}}_3{\mathrm{O}}_4+{\mathrm{H}}_2\to$

Complete the following reaction (write balanced equation).

Complete the following reaction (write balanced equation).