an element x has a valency of 2 and 4 write the chemical formula for oxide of x.

Dear friend,

In first case,

When 'X' has a valency of 2. Then the compound formed will be 'XO' as the valency will be cancel out.

In second case,

When 'X' has a valency of 4. Then the compound formed will be 'XO2' by the criss- cross method.

Hope this answer is helpful :)
Regards...

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