Question

What is the chemical formula of ammonium chloride?

• A. NH₃Cl
• B. NH₄Cl
• C. NHCl
• D. NHCl₄

Answer 1

The correct option is

B

Chemical Formula

The chemical formula of a compound represents the composition of a molecule of compound in terms of symbols of the elements present in it.

The formula of a compound tells us the kind of atoms as well as the number of atoms of

various elements present in one molecule of a compound.

Writing of chemical formula

1)In a chemical formula of a compound, the elements present are represented by their

symbols and the number of atoms of each element are indicated by writing the digits 2,3,4

etc as subscripts on the right hand side bottom of the symbol.

2)If we know the valencies of elements, then we can work out the formula of their

compounds by balancing the valencies of different atoms which occur in compound.

3)First we write the symbol of elements which form compound.

4)Below the symbols of each element, write down the valency.

5)Cross over the valencies of combining atoms.

For example:

Ammonium:$N{H}_4^{+}$

Chloride : $C{l}^{-}$

Using chemical cross method chemical formula of ammonium chloride is NH₄Cl