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Q.

If 200 ml of 0.1 M ${Na}_{2} {SO}_{4}$ is mixed with 100 ml of 0.2 M ${Na}_{3} {PO}_{4}$ solution, molarity of Na+ in the final solution, if final solution has density 1.2 gm/ml, will be:

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a

0.33 M

b

0.5 M

c

none of these

d

0.196 M

answer is B.

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Detailed Solution

Here,

${Na}_{2} {SO}_{4}$ ${Na}_{3} {PO}_{4}$

$\begin{array}{l} V = 200 m l V = 100 ml \\ M = 0.1 M = 0.2 \end{array}$

Molarity of Na+

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If 200 ml of 0.1 M Na2SO4is mixed with 100 ml of 0.2 M Na3PO4 solution, molarity of Na+ in the final solution, if final solution has density 1.2 gm/ml, will be: