Question

The reactions of Li, Na and K with an excess of oxygen results in the formation of X, Y and Z respectively, as major productsThe correct option(s) is/are

• A. X is an oxide, Y is a peroxide and Z is a superoxide
• B. X and Y are diamagnetic but Z is paramagnetic
• C. X is an oxide, Y is a superoxide and Z is a peroxide
• D. aqueous solutions of X, Y and Z are basic in nature

Hint:

Down the group: Li forms oxide, Na forms peroxide, K forms superoxideAlso, superoxide ions are paramagnetic

Answer 1

The Correct Option is A, B, D

Step 1: Products with oxygen.
Lithium gives the oxide, sodium gives the peroxide and potassium gives the superoxide. So statement A is correct.

Step 2: Magnetism.
The oxide and peroxide are diamagnetic, while the superoxide has an unpaired electron and is paramagnetic. Statement B is correct.

Step 3: In water.
All three give basic solutions, so statement D is correct, while statement C mislabels the products.

Step 4: Answer.
\[ \boxed{\text{A, B and D}} \]