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Statement I: Two atoms of X combine with three atoms of Y to form X2Y3

Statement II: From the chemical formula of the compound X2Y3, we can conclude that the valency of X is 2.


A
Statement I is true but II is false
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B
Statement I is false but II is true
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C
Both statements I and II are true
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D
Both statements I and II are false.
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Solution

The correct option is A Statement I is true but II is false

A chemical formula is a symbolic representation that indicates the number of atoms present in the molecule.

From the chemical formula X2Y3, we can understand that two atoms of X combine with three atoms of Y to form one molecule of X2Y3.

We obtain the chemical formula by cross multiplication of valencies.
Symbol: X    Y
                                                   Valency:  3   2

Hence, the valency of Y is 2 and that of X is 3.

Chemistry

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