JEE Main levelSingle correct optionDifficulty 2 of 3ph127
Assertion (A): Xenon forms many more compounds than argon.
Reason (R): Xenon has a lower first ionisation enthalpy and larger size than argon, so its electrons are more easily involved in bonding with fluorine and oxygen.
Choose the correct option.
ABoth A and R are true, and R is the correct explanation of A
BBoth A and R are true, but R is not the correct explanation of A
CA is true but R is false
DA is false but R is true
Answer: A
Ionisation enthalpy falls down the group (Ar about 1520, Xe 1170kJmol−1), so Xe can be oxidised by F2 or O-containing oxidants, while Ar cannot. Both statements are true and R explains A.