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JEE Main 20137 April

Exam: JEE Main
Year: 2013
Date: 7 April
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

JEE Main 2013 · 7 April · Chemistry · Some Basic Concepts of Chemistry

The molarity of a solution obtained by mixing 750mL of 0 . 5 ( M )...

The molarity of a solution obtained by mixing

750mL

of

0 . 5 ( M ) HCl

with

250mL

of

2 ( M ) HCl

will be

Options

A $1 . 75M$
B $0 . 975M$
C $0 . 875M$
D $1 . 00M$

Correct answer

C. $0 . 875M$

Step-by-step solution

\text{M} = \dfrac{{\text{M}}_{1} {\text{V}}_{1} + {\text{M}}_{2} {\text{V}}_{2}}{{\text{V}}_{1} + {\text{V}}_{2}}

= \dfrac{7 5 0 \times 0 \text{.} 5 + 2 5 0 \times 2}{1 0 0 0 }

= \dfrac{3 7 5 + 5 0 0}{1 0 0 0} = 0 \text{.} 8 7 5 \text{M}

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