Question

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:

• A. Statement I is false but Statement II is true
• B. Both Statement I and Statement II are true
• C. Statement I is true but Statement II is false
• D. Both Statement I and Statement II are false

Answer 1

The Correct Option is C

Analyze each statement for accuracy and select the most fitting option.

1. Statement (I): The 4f and 5f-series elements are positioned separately in the Periodic Table to uphold classification principles.
   The 4f and 5f series comprise the lanthanides and actinides. Their separate placement at the bottom of the periodic table, below the main body, preserves the table's structural integrity and clarity by preventing excessive width. This arrangement ensures the periodic nature and classification principles remain evident and manageable. Therefore, Statement (I) is true.
2. Statement (II): s-block elements exist in a pure state in nature. 
   s-block elements, encompassing alkali and alkaline earth metals, are highly reactive. They readily form compounds by losing electrons, rather than occurring in their elemental form in nature. For instance, sodium and potassium are found in salt compounds, not as pure metals. Consequently, Statement (II) is false.

Conclusion: Statement I is true; Statement II is false.