The element which can displace three other halogens from their compound is

Which halogen does not show variable oxidation state?

When $Br_2$ is treated with aqueous solutions of $NaF$,$NaCl$,and $NaI$ separately,which of the following occurs?

Which of the following halogens forms the maximum number of oxoacids?

Which of the following compounds is $NOT$ in the solid state at $25^{\circ} C$?

Which of the following statements regarding the properties of halogens are correct?
$(a)$ Due to small size and strong inter-electronic repulsion,the electron gain enthalpy of fluorine is less negative than that of chlorine.
$(b)$ Iodine has a different physical state and colour compared to other members of the group.
$(c)$ Fluorine does not show a positive oxidation state.
$(d)$ In $X_{2(g)} + H_2O(l) \rightarrow HX(aq) + HOX(aq)$ (where $X = Cl$ or $Br$).