Q.9. What is the charge in coulomb on $F{e}^{3+}$ ion?
(A) 4.8$\times {10}^{-19} C$
(b) 1.6$\times {10}^{-19} C$
(c) 3.2$\times {10}^{-19} C$
(d) 6.4$\times {10}^{-19} C$

Charge in coulomb = ne
n  number of electron transferred = 3 (Fe³⁺)
e= charge of the electron = 1.6 x 10^-19 C
Charge in coulomb = ne = 3 x ​1.6 x 10^-19 = 4.8 x 10^-19 C
Thus option a is correct