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Question

An element X forms an oxide XO3. What can be the valency of element X?

A
5
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B
6
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C
2
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D
4
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Solution

The correct option is B 6

The compound XO3 has three atoms of oxygen.

Valency of one oxygen atom = 2
Valency of three oxygen atoms = 2 x 3 = 6

A molecule is overall neutral in charge. So, the valencies of the ions must balance each other while writing a chemical formula.

So, the valency of X can be 6.


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