Q1.An element X forms an Oxide with formula "X_{2}O_{3}"_{ }:-

(a)State the valency of "X".

(b)Write the formula of chloride of "X".

(c)Sulphate of "X".

_{2}O

_{3}is 3.

(b) The valency of chlorine is 1 and the valency of X is 3.So, the formula for chloride of X is XCl

_{3}

(c) The valency of sulphate ion is 2 and the valency of X is 3.So formula of sulphate of X is X

_{2}(SO

_{4})

_{3}

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