Question

An element X forms an oxide with formula X2O3. The formula of its sulphate and phosphate will be respectively A) XSO4 and X2(PO4)2 B) X2(SO4)3 and XPO4 C) X(SO4)2 and X(PO4)2 D) X2SO4 and X2PO4

Answer 1

Element X oxide is X2O3 which means it's valency is 3.

So formula of its sulphate will be X2(SO4)3

Formula of its phosphate will be XPO4

Answer 2

Answer: The formula of its sulphate and phosphate will be respectively B) X2(SO4)3 and XPO4

Explanation:

Given,

The formula of oxide is X2O3.

To find:

The formula of the sulphate and the phosphate of X.

Step by step explanation:

• Formula of oxide of X is X2O3.
• The valency/oxidation state of X can be calculated, as follow:

         Let the valency of X = a.

             2a + 3(-2) = 0  ; valency of oxygen is -2.

             2a -6 = 0

               a = 3.

• The valency of sulphate is = -2.
• The formula of sulphate of X = X2SO4.

• The valency of sulphate is = -3.
• The formula of sulphate of X = XPO4.

Thus, the formula of sulphate and phosphate of X = X2SO4 and XPO4 respectively.

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