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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 O atom = 2

Valency of three O atoms = 2 x 3 = 6

Since valencies of the ions must balance while writing a chemical formulae.

So, valency of X should be 6; otherwise the reaction is not possible.


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