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Select the incorrect statement among the following

Redox Reactions in Terms of Electron Transfer Reactions
NEET
1

Ortho and para hydrogen differ in proton spin

2

Heavy water is used as a moderator in nuclear reactors

3

Covalent hydrides are formed by p-block elements

4

H₂O₂ oxidises PbS into SO₂

Solution:

Let's analyze each statement:

(1) Ortho and para hydrogen are nuclear spin isomers. They differ in the relative spin of the two protons in the H₂ molecule. This statement is correct.

(2) Heavy water (D₂O) is widely used as a moderator in nuclear reactors to slow down fast neutrons, increasing the probability of nuclear fission. This statement is correct.

(3) Covalent hydrides are formed by elements of p-block (e.g., NH₃, H₂O, HCl, CH₄). This statement is correct.

(4) Hydrogen peroxide (H₂O₂) is a strong oxidizing agent. It oxidizes lead(II) sulfide (PbS) to lead(II) sulfate (PbSO₄), not sulfur dioxide (SO₂). The reaction is: PbS(s) + 4H₂O₂(aq) → PbSO₄(s) + 4H₂O(l). In this reaction, the oxidation state of sulfur changes from -2 in PbS to +6 in PbSO₄. This statement is incorrect.

Therefore, the incorrect statement is (4).

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