Statement-1- An atom having a valency of two can combine with two other atoms- each having a valency of one-Statement-2- The valency of carbon in carbon dioxide CO 2 is two-A- Only statement 1 is true-B- Only statement 2 is true-C- Both statements are false-D- Statement 1 is true but statement 2 is false-

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Valency

Statement-1: ...

Question

Statement-1: An atom having a valency of two can combine with two other atoms, each having a valency of one.

Statement-2: The valency of carbon in carbon dioxide $(C O_{2})$ is two.

Only statement 1 is true.

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Only statement 2 is true.

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Both statements are false.

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Statement 1 is true but statement 2 is false.

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Solution

The correct options are
A Only statement 1 is true.
D Statement 1 is true but statement 2 is false.
The combining capacity of an element is known as its valency. So, an element having a valency of 2 can combine with two atoms of an element having a valency of 1.

The formula of carbon dioxide $(C O_{2})$ is written as shown below.
Symbol: C O
$↘ ↙$
Valency: 4 2

From the above method, the molecular formula of carbon dioxide is $C_{2} O_{4}$ . This is simplified and written as $C O_{2}$ . Hence, the valency of carbon is always 4.

So, the valency of an element cannot always be derived from its compounds.

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Similar questions

Statement-1: An atom of valency 2 can combine with 2 other atoms of valency 1.
Statement-2: The valency of an element is the measure of its combining power with other atoms, when it forms chemical compounds or molecules.

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.

Statement II: From the chemical formula of the compound

X_{2} Y_{3}

, we can conclude that the valency of X is 2.

Statement 1: An atom of valency 2 can combine with 2 other atoms of valency 1.
Statement 2: To write the chemical formula, one must know the valency of the element.

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Statement 2:

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Statement 1: OE > OF
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Statement-1: An atom having a valency of two can combine with two other atoms, each having a valency of one. Statement-2: The valency of carbon in carbon dioxide (CO2) is two.

Statement-1: An atom having a valency of two can combine with two other atoms, each having a valency of one.

Statement-2: The valency of carbon in carbon dioxide $(C O_{2})$ is two.