Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :
- Statement I is false but Statement II is true
- Both Statement I and Statement II are true
- Statement I is true but Statement II is false
- Both Statement I and Statement II are false
Answer
(3) Statement I is true but Statement II is false
Solution
Lanthanoids (4f) and actinoids (5f) are kept in a separate block at the bottom, so that elements of similar properties stay in one column ⇒ Statement-I is true
s-block metals have very low ionisation enthalpy ⇒ highly reactive ⇒ found only in combined state (NaCl, CaCO3, …), never free ⇒ Statement-II is false
Answer: (3)