Question

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

Solution

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