Chlorine is liberated when we heat:

An aqueous solution of a halogen salt of potassium reacts with the same halogen $X_2$ to give $KX_3$,a brown-coloured solution,in which the halogen exists as the $X_3^-$ ion,$X_2$ acts as a Lewis acid,and $X^-$ acts as a Lewis base. The halogen $X$ is:

What are $X$ and $Y$ in the given reactions?
$2X_{2(g)} + 2H_2O_{(l)} \to 4H^{+}_{(aq)} + 4X^{-}_{(aq)} + O_{2(g)}$
$Y_{2(g)} + H_2O_{(l)} \to HY_{(aq)} + HOY_{(aq)}$

Assertion : The halogens absorb visible light.
Reason : All halogens are coloured.

Which of the following fluorides can react with fluorine?

When chlorine water is added to a solution of $KBr$,the solution immediately turns orange-red,because: