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JEE Main 202226 JuneMorning Shift

Exam: JEE Main
Year: 2022
Date: 26 June
Shift: Morning Shift
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

JEE Main 2022 · 26 June · Morning Shift · Chemistry · Some Basic Concepts of Chemistry

A commercially sold conc. HCl is 35 % HCl by mass. If the density...

A commercially sold conc.

HCl

is

35 % HCl

by mass. If the density of this commercial acid is

1 . 46g / mL

, the molarity of this solution is : (Atomic mass :

Cl = 35 . 5amu, H = 1amu

)

Options

A $10 . 2M$
B $14 . 0M$
C $12 . 5M$
D $18 . 2M$

Correct answer

B. $14 . 0M$

Step-by-step solution

Molarity $M = \dfrac{x \times d \times 10}{{m}_{B}}$

$= \dfrac{35 \times 1 . 46 \times 10}{36 . 5} = 14M$

${m}_{B} =$ molecular mass of solute

$d =$ density of the solution in $g / L$

$x = %$ solute by mass.

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