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Question

What will be the normality of a solution obtained by mixing 0.5 N Ca(OH)2 and 0.5 N Mg(OH)2 solution in the ratio 1:5 by volume?

A
0.20 N
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B
0.15 N
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C
0.5 N
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D
0.25 N
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Solution

The correct option is C 0.5 N
Let volume of 0.5 N Ca(OH)2=V
Volume of 0.5 N Mg(OH)2=5V
Now,

N1V1+N2V2=N3V3

where, N1, N2​ are the normality of Ca(OH)2 and Mg(OH)2 respectively and V1​ and V2​ are their volumes respectively.

N3​ and V3​ are the normality & volume of the final solution.

(0.5×V)+(0.5×5V)=N3×(V+5V)0.5V+2.5V=N3×6VN3=0.5 N
The normality of the solution is 0.5 N.

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