A Compound XH is formed by combination of an element X with hydrogen. Find the valency of element X. State the formula of the compounds formed by combination of X with :

(a)Nitrogen (b) Oxygen

The given formula is XH which means the oxidation state of X is +1 and H is -1. Hence valency of both atoms is 1. 
Since the valency of Nitrogen is 3 and Oxygen is 2, therefore when Nitrogen combines with hydrogen it will form X3N and when oxygen combines with X, the compound formed is X2O. 

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valency of x=1+

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