Question

An element Z had a valency of 3. what is the formula of its oxide ?

Answer 1

3 is the given velency of Z and 2 is the velency of oxide

Answer 2

The formula of an oxide of element Z with valency 3 is $Z_2O_3$.

Explanation:

• The statement given says that the valency of element Z is 3.
• The oxides are represented as $O^{2-}$ which means that the valency of oxides is 2.
• Thus the valency of Z is 3 whereas for oxides it is 2. When the valencies are cross multiplied with the combining elements it gives the formula of oxide.
• Accordingly Z = 3, O = 2 which when cross multiplied becomes Z =2 and O = 3.
• When it is written in formula mode it becomes $Z_2O_3$- the formula for the oxides of element Z.

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