Question

Assertion . Sodium reacts with oxygen to form `Na_(2)O_(2)` but potassium reacts with oxygen to form `KO_(2)`
Reason. Potassium is more reactive than sodium .
A. If both assertion and reason are true, and reason is the true explanation of the assertion.
B. If both assertion and reason are true, but reason is not the true explanation of the assertion.
C. If assertion is true, but reason is false
D. If both assertion and reason are false.

Answer 1

Correct Answer - b
Correct explanation . Due to bigger size of `K^(+)` than `Na^(+)`, it has a weak positive field around it which cannot prevent peroxide ion `(O_(2)^(2-))` to combine with another oxygen atom to form superoxide , `O_(2)^(-)` .