Statement I- If the valency of an element X is 4 - it can combine with four hydrogen atoms-Statement II- The compound formed in the above case have a molecular formula XH 4-A- Statement I and II are incorrect-B- Statement I and II are correct-C- Statement I is correct but II is not-D- Statement II is correct but I is not-

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Standard VIII

Chemistry

Molecular Formula

Statement I: ...

Question

Statement I: If the valency of an element X is 4, it can combine with four hydrogen atoms.

Statement II: The compound formed in the above case have a molecular formula $X H_{4}$ .

Statement I and II are correct.

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Statement I and II are incorrect.

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Statement I is correct but II is not.

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Statement II is correct but I is not.

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Solution

The correct option is A Statement I and II are correct.
Valancy is defined as the combining capacity of an element. X, an element has a valency of four and hence, can combine with four other hydrogen atoms, having a valency of one.

When X combines chemically with four hydrogen atoms, the compound formed will have a molecular formula $X H_{4}$ as shown below.

Symbol: X H
$↘ ↙$
Valency: 4 1

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Statement I: If the valency of an element X is 4, it can combine with four hydrogen atoms. Statement II: The compound formed in the above case have a molecular formula XH4.

Statement I: If the valency of an element X is 4, it can combine with four hydrogen atoms.

Statement II: The compound formed in the above case have a molecular formula $X H_{4}$ .