$Cl_{2}O_{7}$ is the anhydride of

Identify the false statement from the following about fluorine.

The hydrolysis products of the $BrF_5$ molecule are given by the reaction: $BrF_5 + 3H_2O \rightarrow HBrO_3 + 5HF$. What are the products of this reaction?

The correct order of acidic strength is:

Which among the following does not form polyhalide ion?

In the production of $UF_6$ required for the enrichment of ${}^{235}U$,which of the following is used?