KVPY SA Exam 2012 Question Paper

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Question : 72 of 80

Marks: +1, -0

Upon mixing equal volumes of aqueous solutions of 0.1 M HCl and 0.2 M

\H_2\SO_4

, the concentration of

\H^{+}

in the resulting solution is

0.30 mol/L
0.15 mol/L
0.25 mol/L
0.10 mol/L

Solution:

0.1M HCl, V volume
H moles = 0.1V
0.2M

\H_2 \SO_4

, V volume

\H^{+}

moles

= 0.2× 2 ×\V= 0.4\V

Total moles of

\H^{+}

=0.4\V+0..1\V=0.5\V

[\H^{+}]=\moles/{\Vol.}={0.5\V}/{2\V}

= 0.25 M/L

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