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Writing Chemical Formula

An element X ...

Question

An element $X$ forms an oxide ${XO}_{3}$ . 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 ${XO}_{3}$ 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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Similar questions

An element A forms an oxide $A_{2} O_{5}$ .

(a) What is the valency of element A?
(b) What will be the formula of chloride of A?

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