Question

if the chemical formula of the chlorides of an element E are ECl3 and ECl5, then the chemical formula of its oxide will be.
a. E2O4 and E2O5
b. E2O3 and E2O6
c. E2O2 and E3O5
d. E2O3 and E2O5​

Answer 1

Molecular formula of the chloride of an element X is XCl3

=> Valency of X=3+

then molecular formula of its oxide will be

X2O3.

OR

We can identify X as Aluminium and can proceed.

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