The number of electrons in one coulomb of electric charge is:

The correct answer is Option (2) → $6.25×10^{18}$

Charge on single electron, $e=-1.6×10^{-19}C$

∴ n, total no of electron per coulomb = $\frac{Total\,charge}{Charge\,of\,one\,electron}$

$n=\frac{1}{6.25×10^{-19}}$

$=6.25×10^{18}$