Which of following is not a property of fluorine?

It is a pale greenish yellow gas.

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It is poisonous in nature

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It is lighter than air.

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It is a strong oxidiser.

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Solution

The correct option is A It is lighter than air.
Molecular weight of air $O_{2}$ is 32, and the molecular weight of $F_{2}$ is 39. So $F_{2}$ is heavier than $O_{2}$ .
Hence option is correct.

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Which of the following statement is not correct about carbon dioxide acting as a fire extinguisher for electrical fires ?

(a) it is heavier than air

(b) it is lighter than air

(d) it does not support combustion

Which of the following gas is a greenish yellow colour which also bleaches?

H N O_{2}

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