Which of the following pairs contain equal number of atoms?

Options

A. 22.4 L (STP) of nitrous oxide and 22.4 L of nitrifc oxide
B. 1 millimole of HCl and 0.5 millimole of `H_(2)S`
C. 1 mole of `H_(2)O_(2)` and 1 mole of `N_(2)O_(4)`
D. 11.2 cc (STP) of nitrogen and 0.015g of nitric oxide

Explanation

d) Number of atoms in `N_(2)`
`=(11.2 xx 10^(-3) xx 6.023 xx 10^(23) x 2)/(22.4) = (6.023 xx 10^(20)`
Number of atoms in NO = `(0.015 xx 2 xx 6.023 xx 10^(23))/(30)`
`=6.023 xx 10^(20)`