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Question

The equivalent weight of a certain trivalent element is 20. Molecular weight of its oxide is :

A
152
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B
56
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C
168
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D
68
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Solution

The correct option is C 168
Atomic mass of element= Equivalent mass of element× Valency=20×3=60g/mol \

The oxide can be represented as E2O3 where E represents element.

The molecular weight of oxide is 2(60)+3(16)=168g/mol

Hence the correct option is C.

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