Answer :

(a)Since it belongs to group 13, therefore no. of valence electrons= 3

The Valency of element X is 3

(b)When 'X' reacts with element 'Y', the compound formed will be:

Therefore, the Molecular formula of compound formed is X_{2}Y_{3.}

(c)When X combines with chlorine:

Atomic no of X = 13

i.e. X is Aluminum Al

Valency of X is 3

Valency of chlorine is 1

Therefore, the molecular formula will be:

Compound: AlCl_{3}

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