Q47 of 203 Page 153

An element X forms the following compounds with hydrogen, carbon and oxygen:

H2X, CX2, XO2, XO3

Valency of X -

(i) In H2X: -2


(ii) In CX2: -2


(iii) In XO2: +4


(iv) In XO3: +6


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The formula of the sulphate of an element X is X2(SO4)3. The formula of nitride of element X will be:

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An element A forms an oxide A2O5.

(a) What is the valency of element A?


(b) What will be the formula of chloride of A?

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If the aluminium salt of an anion X is Al2X3, what is the valency of X? What will be the formula of the magnesium salt of X?

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The formula of carbonate of a metal M is M2CO3.

(a) What will be the formula of its iodide?


(b) What will be the formula of its nitride?


(c) What will be the formula of its phosphate?