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Redox Reactions MCQs for NEET — Chemistry Questions with Answers

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The oxidation number and covalency of sulphur in the sulphur molecule (S₈) are respectively:

0 and 2

+6 and 8

0 and 8

+6 and 2

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Explanation

(a) Oxidation number in elemental form is zero. Co-valency is two because of S-S-S-S-chain.

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H₂S is passed through an acidified solution of copper sulphate and a black precipitate is formed. This is due to:

oxidation of Cu²⁺

reduction of Cu²⁺

double decomposition

reduction and oxidation

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Explanation

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The most common oxidation state of an element is -2. The number of electrons present in its outermost shell is:

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Explanation

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In the following reaction:

4P + 3KOH + 3H₂O $\to$ 3KH₂PO₂ + PH₃:

P oxidised only

P is reduced only

P is oxidised as well as reduced

none of the above

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Explanation

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In which SO₂acts as oxidant, while reacting with:

acidified KMnO₄

acidified K₂Cr₂O₇

H₂S

acidified C₂H₅OH

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Explanation

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In the reaction;

3Br₂ + 6C $O_{3}^{2 -}$ + 3H₂O $\to$ 5Br^- + Br $O_{3}^{-}$ + 6HC $O_{3}^{-}$

which statement is correct?

Br₂ is oxidised

Br₂ is reduced

Br₂ is neither oxidised nor reduced

Br₂ is oxidised and reduced as well

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Explanation

(d) B $r_{2}^{0}$ $\to$ 2Br⁵⁺ + 10e; B $r_{2}^{0}$ + 2e $\to$ 2Br^-

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Hypochlorite disproportionate to give

Cl^- and Cl $O_{4}^{-}$

Cl $O_{4}^{-}$ and Cl $O_{3}^{-}$

Cl $O_{3}^{-}$ and Cl^-

Cl $O_{2}^{-}$ and Cl^-

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Which has highest normality?

1MH₃PO₂

1MH₃PO₃

1MH₃PO₄

All of these

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Explanation

H₃PO₂ is monobasic, H₃PO₃ is diabasic and H₃PO₄ is tribasic.

1MH₃PO₂ =1NH₃PO₃ , 1M H₃PO₃ =2N H₃PO₃ and 1M H₃PO₄ =3N H₃PO₄

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Amongst the following identify the species with an atom in (+6) oxidation state.

Mn $O_{4}^{-}$

Cr $(CN)_{}^{3 -} 6$

Ni $F_{6}^{2 -}$

CrO₂Cl₂

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Explanation

Cr O₂ Cl₂

x + 2(-2) + 2(-1) = 0

x = +6

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Mg(OH)₂ + HCl $\to$ Mg(OH)Cl + H₂O₂, the equivalent weight of Mg(OH)₂ will be (M= Mol. wt. of Mg(OH)₂)

zero

M/2

M/4

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Explanation

Mg(OH)₂ + HCl $\to$ Mg(OH)Cl + H₂O₂,

In this reaction, only one -OH group of Mg(OH)₂ is replaced by -Cl. Hence, n-factor of Mg(OH)₂ will be 1.

Equivalent wt. of Mg(OH)₂ = M/l=M

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