JEE Previous Year Question

$15\text{mL}$ of aqueous solution of ${\text{Fe}}^{2+}$ in acidic medium completely reacted with $20\text{mL}$ of $0.03M$ aqueous${\text{Cr}}_2{O}_7^{2-}$ The molarity of the ${\text{Fe}}^{2+}$ solution is $\text{\_}\text{\_}\text{\_}\text{\_}\text{\_}\text{\_}\times {10}^{-2}M$
(Round off to the Nearest Integer).

Topic: JEE PYQ

Answer: 24. Full step-by-step solution below.