HF is present as an impurity in gaseous fluorine. It can be removed by passing over:

P_{2} O_{5}

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N a F

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H_{2} S O_{4}

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C a C 1_{2}

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Solution

The correct option is B $N a F$
To make the gaseous fluorine free from $H F$ vapors, it is passed through copper U-tubes containing $N a F$ .
$N a F + H F \to N a H F_{2}$
This is Dennis Method for isolation of fluorine.

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