$A$ gas reacts with $CaO$,but not with $NaHCO_3$. The gas is

Which one of the following reacts with glass?

On boiling an aqueous solution of $KClO_3$ with iodine,the following product is obtained:

The interhalogen which does not exist is

Aluminium trifluoride is insoluble in anhydrous $HF$ but dissolves on addition of $NaF$. Aluminium trifluoride precipitates out of the resulting solution when gaseous $BF_3$ is bubbled through. Give reasons.

Oxyacids of chlorine show similarity in