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Factors Affecting Alpha

100ml of 0.3N...

Question

100ml of 0.3N $H N O_{3}$ and 200ml of $0.3 M H_{2} S O_{4}$ are mixed together. Normality of $H^{+}$ in the resulting solution is:

0.9 N

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0.6 N

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0.4 N

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0.5 N

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Solution

The correct option is B $0.5 N$
Valency factor of $H^{+}$ ion is 1.
Therefore its molarity and normality are same for $H N O_{3}$ but not $H_{2} S O_{4}$ .
Now,
milimoles of $H^{+} i n H N O_{3} = 100 \times 0.3 = 30$

milimoles of $H^{+} i n H_{2} S O_{4} = 200 \times 0.3 \times 2 = 120$

Total millimoles of $H^{+} = 150$
Volume $= 300 m l$
Therefore, resultant normality $= \frac{150}{300} = 0.5 N$

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