Which of the following halogens releases oxygen when passed through a hot concentrated solution of potassium hydroxide?

An inorganic white crystalline compound $(A)$ has a rock salt structure. $(A)$ on reaction with conc. $H_2SO_4$ and $MnO_2$ evolves a pungent smelling,greenish-yellow gas $(B)$. Compound $(A)$ gives a white precipitate of $(C)$ with $AgNO_3$ solution. Compounds $(A)$,$(B)$,and $(C)$ will be respectively:

Write the reactions of $F_{2}$ and $Cl_{2}$ with water.

What is the final chemical form of Gold $(Au)$ when it is dissolved in aqua-regia?

The correct order of acidic strength of oxy-acids of chlorine is

Which of the following is prepared by the electrolytic method?