X, Y and Z are each one of the three elements chlorine, bromine and iodine. If aqueous X is mixed with aqueous ions of Y, no reaction occurs. If aqueous Y is mixed with aqueous ions of Z, no reaction occurs. Which statement is correct?
- AX is more reactive than Y.
- BX is a pale yellow-green gas at room temperature and pressure.
- CY is a red-brown liquid at room temperature and pressure.
- DZ is less reactive than Y.