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JEE Main 20179 AprilOnline

Exam: JEE Main
Year: 2017
Date: 9 April
Mode: Online
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

JEE Main 2017 · 9 April · Online · Chemistry · Some Basic Concepts of Chemistry

What quantity (in mL ) of a 45 % acid solution of a mono-protic...

What quantity (in

mL

) of a

45 %

acid solution of a mono-protic strong acid must be mixed with a

20 %

solution of the same acid to produce

800mL

of a

29 . 875 %

acid solution?

Options

A $316$
B $320$
C $325$
D $330$

Correct answer

A. $316$

Step-by-step solution

\dfrac{V \times 45}{100} + \dfrac{\left(800 - V\right)20}{100} = \dfrac{800 \times 29 .875}{100}

\dfrac{9V}{20} + 160 - \dfrac{V}{5} = 239

\dfrac{5V}{20} = 79 ⇒ V = 316

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