QJEEM21Ch5fe7: JEE Main 2021 Chemistry - Class 11 JEEM21Ch5fe7 Solution: 15 mL of aqueous solution of Fe 2+ in acidic medium completely…

Question

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15 mL of aqueous solution of Fe²⁺ in acidic medium completely reacted with 20 mL of 0.03 M aqueous Cr₂O

_7^{2 - }

. The molarity of the Fe²⁺ solution is __________

\times

10^-2 M. (Round off to the Nearest Integer).

Accepted Answer

C{r_2}{O_7}^{2 - } + F{e^{2 + }}\mathrel{\mathop{\kern0pt\longrightarrow}\limits_{}} C{r^{3 + }} + F{e^{3 + }}

Valance Factor of

C{r_2}{O_7}^{2 - }

= 6

Valance Factor of

F{e^{2 + }}

= 1

mili eq. of

C{r_2}{O_7}^{2 - }

= mili eq. of Fe²⁺

6(0.03

\times

20) = 1(M

\times

15)

M = 6(0.03)4/3

M = 0.24 M

M = 24

\times

10^{$-$ 2} M

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