Question

The number of nitrogen atoms present in one molecule of zinc nitrate is

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is B

2

• .The total number of atoms present in a molecule is called atomicity.
• The chemical formula of a compound shows its constituent elements and the number of atoms of each combining elements.

Explanation for correct answer

• The molecular formula of zinc nitrate is Zn(NO₃)₂ .
• The valency of Zn is two and nitrate ion is one (NO₃)^-1.
• The formula of simple compound is obtained by interchanging the valency.
• The number of atoms of each element present in Zn(NO₃)₂ is Zn -1, N -2, O -6..
• Therefore the atomicity of zinc nitrate is 9.

Hence, the number of nitrogen atoms present in one molecule of zinc nitrate is 2.