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Solution


Q.

Given below are two statements:

Statement (I): The 4f and 5f- series of elements are placed separately in the Periodic table to preserve the principle of classification.

Statement (II): s-block elements can be found in pure form in nature.

In the light of the above statements, choose the most appropriate answer from the options given below:              [2024]
1 Both Statement I and Statement II are false  
2 Statement I is false but Statement II is true  
3 Statement I is true but Statement II is false  
4 Both Statement I and Statement II are true  

Ans.

(3)  

Statement I: Outermost shell for 4f series elements is 6th shell, hence these are placed in 6th period. Outermost shell for 5f series elements is 7th shell, hence these are placed in 7th period. This is a true statement.

Statement II: s-block elements are highly reactive and are not found in pure form in nature.