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Question

Calculate the equivalent weight of the following substance as acid or base.
Zn(OH)2−4
If M is the molecular weight and E is the equivalent weight, then :

A
E=M3
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B
E=M4
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C
E=M6
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D
None of these
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Solution

The correct option is B E=M4
1 mole of Zn(OH)24contains 4 moles of replaceable hydroxide ions.

Hence, its equivalent weight is equal to one fourth of its molecular weight.

Equivalent mass of a base =Molar mass of the baseNumber of replaceable hydroxide ions

E=M4

Hence the correct option is B.

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