When fluoride is heated with conc. H_2SO_4 an | vedclass

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(D) When a fluoride salt (e.g.,$NaF$) is heated with concentrated $H_2SO_4$,$HF$ gas is produced: $2NaF + H_2SO_4 \rightarrow Na_2SO_4 + 2HF$. Unlike

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(D) When a fluoride salt (e.g.,$NaF$) is heated with concentrated $H_2SO_4$,$HF$ gas is produced: $2NaF + H_2SO_4 \rightarrow Na_2SO_4 + 2HF$. Unlike chloride,bromide,or iodide salts,fluoride salts do not undergo oxidation by $MnO_2$ in the presence of $H_2SO_4$ to release the free halogen $(F_2)$. This is because the standard reduction potential of $F_2$ is very high,making it the strongest oxidizing agent,and it cannot be produced by chemical oxidation of $F^-$ ions. Therefore,no $F_2$ gas is evolved.

When fluoride is heated with conc. $H_2SO_4$ and $MnO_2$,the gas evolved is:

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