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Q.

Which of the following combinations or processes leads to formation of a paramagnetic species?

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a

Electrolysis of very dilute sodium chloride solution

b

Reaction between 2- ethyl anthraquinol and dioxygen $(O_{2})$

c

Heating of Galena with conc $H N O_{3}$

d

Potassium in water at room temperature

answer is A, C.

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Detailed Solution

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(A) At anode $H_{2} O \to \frac{1}{2} O_{2} + 2 e + 2 H^{+}$
At cathode $2 H_{2} O + Z e \to H_{2} + Z O \bar{H}$ is paramagnetic
(B) $H_{2} O_{2}$ is not paramagnetic
(C) $P b s + \underset{C m c}{H N O_{3}} \to \underset{p a r a m a g n e t i c}{N O}$
(D) potassium react with water

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