JEE Main · 2020 · 03 Sep 2020 · Shift 2 · Some Basic Concepts of Chemistry

The volume (in mL ) of 0.1 N NaOH required to neutralise 10 mL of 0.1 N phosphinic acid is ____.

Answer: 10

Solution

Phosphinic, or hypophosphorous, acid

H_{3} P O_{2}

has only one hydrogen bonded to oxygen that it can give up, so it is monobasic and its normality matches its molarity for neutralisation. Equating gram-equivalents,

N_{acid} V_{acid} = N_{base} V_{base}

, gives

0.1 \times 10 = 0.1 \times V

, so

V = 10 mL

of NaOH is needed.

JEE Main · 2020 · 03 Sep 2020 · Shift 2 · Integer answer

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