Question

Assertion: Helium and beryllium have similar outer electronic configuration of the type `ns^(2)`.
Reason: Both are chemically inert.
A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If the assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer 1

Correct Answer - C
Correct Reason: Although `He` and `Be` have simialr outer electronic configuration of the type `ns^(2)` only `He(1s^(2))` has inset gas configuration and hence is chemically inert byt `Be (1s^(2) 2s^(2))` dose not have inert configuration and hence is not chemically inert.