What is the main product formed when chlorine gas is passed over dry slaked lime at room temperature?

Fluorine with dilute $NaOH$ gives

The formulas of some fluorides are given below. Which of them will combine further with fluorine?

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

Fluorine reacts with water to give

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: