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Redox Reactions MCQs for NEET — Chemistry Questions with Answers

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$H_{2} O_{2}$ is prepared in the laboratory when:

$M n O_{2}$ is added to dilute cold $H_{2} S O_{4}$

$B a O_{2}$ is added to $C O_{2}$ bubbling through cold water

$P b O_{2}$ is added to an acidified solution of $K M n O_{4}$

$N a_{2} O_{2}$ is added to boiling water

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Explanation

(2)

Hydrogen peroxide can be prepared in the laboratory by the action of ice cold, dilute sulphuric acid on sodium peroxide or hydrated barium peroxide (BaO2. 8H2O). Most of the sodium sulphate separates out on cooling as crystals of Na2SO4.

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$H_{2} O_{2}$ on treatment with chlorine gives:

$H_{2}$

oxygen

HOCl

$C l O_{2}$

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For the bleaching of hair, the substance used is:

$S O_{2}$

bleaching powder

$H_{2} O_{2}$

$O_{3}$

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Explanation

Hydrogen peroxide is one of the most common lightening agents. The peroxide is used in an alkaline solution, which opens the hair shaft to allow the peroxide to react with the melanin

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A given solution of $H_{2} O_{2}$ is 30 volume. Its concentration in terms of molarity is:

9.1 M

2.68 M

2.5 M

26.8 M

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Explanation

Volume strength is 30.

Molarity = Volume strength / 11.2 = 30/ 11.2 = 2.68M

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Decolourisation of acidified potassium permanganate occurs when $H_{2} O_{2}$ is added to it. This is due to:

oxidation of $K M n O_{4}$

reduction of $K M n O_{4}$

both oxidation and reduction of $K M n O_{4}$

none of these

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$H_{2} O_{2} r e d u c e s K_{3} [F e {(C N)}_{6}] i n :$

neutral solution

acidic solution

alkaline solution

non-polar medium

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The acidified solution of $F e C l_{3}$ is reduced by passing:

ordinary $H_{2}$

$O_{2}$

nascent H

$H_{2}$

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The percentage of a para-hydrogen in ordinary hydrogen increases when:

temperature is lowered

temperature is increased

pressure is increased and temperature decreased

none of these

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Explanation

temperature is lowered

molecular hydrogen in which the two hydrogen nuclei are spinning in opposite directions so that their contribution to the total angular momentum is zero.

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When sulphur is heated with NaOH(aq) the compounds formed are:

Na₂S + H₂O

Na₂SO₃ + H₂O

Na₂S + Na₂S₂O₃ + H₂O

Na₂S₂O₃ + H₂O

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Explanation

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Which of the following acts as reducing agent as well as oxidising agent?

Na₂O

Na₂O₂

NaNO₃

KNO₃

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Explanation

(b) $O_{2}^{- 1}$ can be oxidised to O₂ and can be reduced to O^-2.

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