3.92 g of ferrous ammonium sulphate react completely with 50 ml N 10 KMnO_ 4 solution. The percentage purity of the sample is

Correct answer: A. 50 Eq of KMnO_ 4 used =(50 × 1)/(1000 × 10)=0.005 Eq of FAS reacted =0.005 weight of FAS needed =0.005 ×392=1.96 g Thus percentage purity of FAS is 50 \%

BITSAT 2014

Exam: BITSAT
Year: 2014
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

BITSAT 2014 · Chemistry · Some Basic Concepts of Chemistry

3.92 g of ferrous ammonium sulphate react completely with 50 ml N...

3.92 \mathrm{ g}

of ferrous ammonium sulphate react completely with

50 \mathrm{ml} \frac{\mathrm{N}}{10} \mathrm{KMnO}_{4}

solution. The percentage purity of the sample is

Options

A50
B78.4
C80
D39.2

Correct answer

A. 50

Step-by-step solution

Eq of

\mathrm{KMnO}_{4}

used

=\frac{50 \times 1}{1000 \times 10}=0.005\therefore

Eq of FAS reacted

=0.005\therefore

weight of FAS needed =0.005

\times392=1.96 \mathrm{ g}

Thus percentage purity of FAS is

50 \%

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