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A elements 'X' forms an oxide with formu...

A elements 'X' forms an oxide with formulat `X_(2)O_(5)`
(i) State the valency of X.
(ii) Write the formula of (a) chloride (b) sulphate (c )nitrate (d) phosphate of X.

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(I) Form the given formula `X_(2)O_(3)` the valence of the elements X is 3.
(ii) Based upon that, the formulae of different compound are:

Chemical formulae of a few compound are given for reference.
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