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JEE Main 202125 JulyMorning Shift

Exam: JEE Main
Year: 2021
Date: 25 July
Shift: Morning Shift
Subject: Chemistry
Chapter: Redox Reactions

JEE Main 2021 · 25 July · Morning Shift · Chemistry · Redox Reactions

When 10mL of an aqueous solution of Fe ^ 2 + ions was titrated in...

When

10mL

of an aqueous solution of

{Fe}^{2 +}

ions was titrated in the presence of dil

{H}_{2}{SO}_{4}

using diphenylamine indicator,

15mL

of

0 . 02M

solution of

{K}_{2}{Cr}_{2}{O}_{7}

was required to get the end point. The molarity of the solution containing

{Fe}^{2 +}

ions is

x \times {10}^{- 2}M

. The value of

x

is ______. (Nearest integer)

Correct answer

0

Step-by-step solution

milli-equivalents of ${Fe}^{2 +} =$ milli-equivalents of ${K}_{2}{Cr}_{2}{O}_{7}$

$M \times 10 \times 1 = 0 . 02 \times 15 \times 6$

$M = 0 . 18 = 18 \times {10}^{- 2}M$

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