Question

Among CaH2,NH3,NaH and B2H6 which are covalent hydride ?

Answer 1

NH3 AND B2H6 are COVALENT HYDRIDE.
CaH2 and NaH are ionic hydrides.

Answer 2

Answer: $NH_{3}$ and $B_{2}H_{6}$ are covalent hydride.

Explanation:

A covalent hydride is a hydride in which the elements of compound form a bond by sharing of electrons.

It is known that calcium and sodium have excess of electrons. Therefore, they donate theri extra electrons in order to gain stability and therefore, they form ionic bond.

Whereas nitrogen and boron are electron deficient in nature. Hence, the form bonds by sharing of electrons.

Therefore, we can conclude that out of the given options $NH_{3}$ and $B_{2}H_{6}$ are covalent hydride.