Assertion (A) Sodium reacts with oxygen to form Na 2 O 2 but potassium reacts with oxygen to form KO 2. Reason (R) Potassium is more reactive metal than sodium.

Question

Assertion (A) Sodium reacts with oxygen to form Na 2 O 2 but potassium reacts with oxygen to form KO 2. Reason (R) Potassium is more reactive metal than sodium. (A) If both Assertion and Reason are true and Reason is correct explanation of Assertion. (B) If both 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 both Assertion and Reason are false.

Tardigrade Admin · Accepted Answer

It is because of bigger size of K +than Na +, a weak positive field arises around it which cannot prevent peroxide ion ( O 22-) to combine with another oxygen atom to form superoxide, O 2-.

Q. Assertion $(A)$ Sodium reacts with oxygen to form $N a_{2} O_{2}$ but potassium reacts with oxygen to form $K O_{2}$ .
Reason $(R)$ Potassium is more reactive metal than sodium.

If both Assertion and Reason are true and Reason is correct explanation of Assertion.

If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

If Assertion is true but Reason is false.

If both Assertion and Reason are false.

It is because of bigger size of $K^{+}$ than $N a^{+}$ , a weak positive field arises around it which cannot prevent peroxide ion $(O_{2}^{2 -})$ to combine with another oxygen atom to form superoxide, $O_{2}^{-}$ .

Q. Assertion (A) Sodium reacts with oxygen to form Na2​O2​ but potassium reacts with oxygen to form KO2​. Reason (R) Potassium is more reactive metal than sodium.