A greenish yellow gas of halogen family turns moist blue litmus paper red.

True

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False

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Solution

The correct option is A True
Chlorine gas is greenish yellow in colour.
When it reacts with moist litmus paper, the following reaction takes place
$Cl_{2} + H_{2}O \Rightarrow HCl +HClO$
Since HCl (acid) is formed, it will turn the blue litmus to red.

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