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Question

1MNaOH solution was slowly added into 1000 mL of 183.75 g impure H2SO4 solution and the following plot was obtained. The percentage purity of H2SO4 sample and slope of the curve respectively, are
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A
75%,13
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B
80%,12
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C
80%,1
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D
none of these
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Solution

The correct option is C 80%,1
Moles of NaOH consumed when reacted with H+=3×1.
Moles of H2SO4 present in sample=1.5.
Weight of H2SO4 in sample=1.5×98=147g.
% purity=147183.75×100=80.
Slope of curve =yx=33=1 (as angle of line is more than 90).

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