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Question

An element "X" of valency 3 forms oxide with chemical formula X2O3. Find:
(i) the ions present in the compound.
(ii) the chemical formula of its chloride.
(iii) the chemical formula of its sulphide.
[5 Marks]

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Solution

(i) Given that the chemical formula of oxide containing element X is X2O3 and the valency of X is 3.
Thus, the ions present in the compound are : X3+ and O2

[1 Mark]

(ii) Valency of X3+ = 3
Valency of Cl = 1

Upon criss-crossing the valancies:
Symbol X Cl
Valency 3 1

The chemical formula of the chloride is XCl3.

[2 Marks]

(iii) Valency of X3+ = 3
Valency of S2 = 2

Upon criss-crossing the valencies,
Symbol X S
Valency 3 2

The chemical formula of the sulphide is X2S3.

[2 Marks]

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