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Q.

What is the molecular formula of Calcium hydride?

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a

{CaH}_{2}

b

CaH

c

{Ca}_{2} H

d

{Ca}_{2} H_{2}

answer is A.

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Detailed Solution

concept - Molecular formula is a way to represent a molecule by writing its number of atoms of each element present in its structure.
Calcium hydride is an ionic compound with calcium ion (

{Ca}^{2 +}

) as the cation and hydride ion (

H^{-}

) as the anion.
As per the crisscross method, while writing the ionic formula of any compound, the numerical value of each of the ionic charges crosses over to become the subscript of the other ion.
Thus, the subscript of Ca becomes 1 and the subscript of H becomes 2 and the molecular formula of calcium hydride is

{CaH}_{2}

.
Hence, the correct option is (1).

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