Chemistry - Complete s-block Question with Solution | TestHub
Choose the correct statement(s) : -
(A) Oxidation state of oxygen is higher in 'X' as compared to 'Y'
(B) Both 'X' and 'Y' are diamagnetic
(C) 'Y' on reaction with water produces
(D) Moist 'X' on reaction with produces
(E) Both X and Y are basic in nature
(F) X is soluble while Y is insoluble in nature.
Answer:
Solution:
The reaction of Na with limited air forms sodium oxide (X = Na₂O). With excess air, sodium forms sodium peroxide (Y = Na₂O₂).
(A) Oxidation state of oxygen in Na₂O is -2, and in Na₂O₂ is -1. So, oxygen's oxidation state is higher in Y. (Incorrect)
(B) Na₂O is diamagnetic. Na₂O₂ contains (O₂)²⁻ ion, which is diamagnetic. (Correct)
(C) Na₂O₂ (Y) reacts with water to produce H₂O₂: Na₂O₂(s) + 2H₂O(l) -> 2NaOH(aq) + H₂O₂(aq). (Correct)
(D) Moist Na₂O (X) reacts with CO₂ to produce Na₂CO₃: Na₂O(s) + CO₂(g) -> Na₂CO₃(s). (Correct)
(E) Both Na₂O and Na₂O₂ are basic oxides. (Correct)
(F) Both Na₂O and Na₂O₂ are soluble in water. (Incorrect)
Therefore, statements (B), (C), (D), and (E) are correct.
