0.01 M KMnO₄ solution was added to 20.0 mL of 0.05 M Mohr's salt solution through a burette. The initial reading of 50 mL burette is zero. The volume of KMnO₄ solution left in the burette after the end point is ____________ mL. (nearest integer)

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answer is 30.

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Detailed Solution

$\begin{array}{l} \underset{{KMnO}_{4}}{\underset{⏟}{N_{1} V_{1}}} = \underset{Mohr salt}{\underset{⏟}{N_{2} V_{2}}} \\ 0 .01 \times 5 \times V_{1} = 0 .05 \times 1 \times 20 \\ V_{1} = 20 ml used \end{array}$

$∴$ Volume left = 50 ml– 20 ml = 30 ml

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