JEE Main · 2023 · 25 Jan 2023 · Shift 1 · Some Basic Concepts of Chemistry

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The density of a monobasic strong acid (Molar mass 24.2 g mol ) is 1.21 kg L . The volume of its solution required for the complete neutralization of 25 mL of 0.24 M NaOH is ______ ×

1 0^{- 2} mL

(Nearest integer)

Answer: 12

Solution

Complete neutralisation needs as many millimoles of the monobasic acid as of sodium hydroxide, namely

0.24 \times 25 = 6

mmol. The mass of acid is

6 \times 24.2 = 145.2

mg, or

0.1452

g. With the acid density

1.21

g mL

^{- 1}

, this occupies a volume

0.1452/1.21 = 0.12

mL, which is

12 \times 1 0^{- 2}

mL.

JEE Main · 2023 · 25 Jan 2023 · Shift 1 · Integer answer

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