Blog Log in Get Started Free

Redox Reactions MCQs for NEET — Chemistry Questions with Answers

Practice free Redox Reactions (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

Language English हिंदी

Chapter Difficulty Show only questions I answered incorrectly Clear Register free for difficulty & keyword filters

● ● ● ● ●

When an acidified solution of ferrous ammonium sulphate is treated with KMnO₄ solution, the ion which is oxidised is:

Fe²⁺

S $O_{4}^{2 -}$

N $H_{4}^{+}$

Mn $O_{4}^{-}$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(a) Fe²⁺ $\to$ Fe³⁺ + e

● ● ● ● ●

In the reaction,

Cr₂ $O_{7}^{2 -}$ +14H⁺ + 6I^- $\to$ 2Cr³⁺ + 7H₂O + 3I₂,

Which element is reduced?

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(d) C $r_{2}^{6 +}$ + 6e $\to$ 2Cr³⁺

● ● ● ● ●

In the reaction,

2Na₂S₂O₃+ I₂ $\to$ Na₂S₄O₆ + 2NaI,

the oxidation state of sulphur is:

decreased

increased

unchanged

none of these

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(b) 2 $S_{2}^{2 +}$ $\to$ $S_{4}^{5 / 2}$ +2e

● ● ● ● ●

In the aluminothermic process, aluminium acts as:

an oxidising agent

a flux

a reducing agent

a solder

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

● ● ● ● ●

Which of the following change represents a disproportionation reaction(s)?

Cl₂ + 2OH^- $\to$ ClO^- + Cl^- + H₂O

Cu₂O(s) + 2H⁺ $\to$ Cu²⁺ + Cu(s) + H₂O

2HCuCl₂ $\to_{water}^{Dilution with}$ Cu + Cu²⁺ + 4 Cl^- + 2H⁺

All of the above

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(d) The same species in each reaction is oxidised and reduced well to give disproportionation reaction.

● ● ● ● ●

During a redox change, the oxidant K₂Cr₂O₇ is always reduced to:

Cr⁵⁺

Cr⁴⁺

Cr³⁺

Cr²⁺

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

● ● ● ● ●

The reaction,

3ClO^-(aq) $\to$ Cl $O_{3}^{-}$ (aq) + 2Cl^-(aq)

is an example of:

oxidation reaction

reduction reaction

disproportionation reaction

decomposition reaction

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(c) Cl atom is oxidised (Cl¹⁺ $\to$ Cl⁵⁺ +4e) as well as Cl atom is reduced (Cl¹⁺ + 2e $\to$ Cl^-) Such reactions are called auto redox or disproportionation reactions.

● ● ● ● ●

Oxidation state of +1 for phosphorus is found in:

H₃PO₃

H₃PO₄

H₃PO₂

H₄P₂O₇

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$∴$ a = +1

● ● ● ● ●

Which is not a redox change?

CaCO₃ $\to$ CaO + CO₂

2H₂ + O₂ $\to$ 2H₂O

Na + H₂O $\to$ NaOH + 1/2 H₂

MnCl₃ $\to$ MnCl₂ + 1/2 Cl₂

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(a) No change in oxidation no. in any of the species.

● ● ● ● ●

If H₂S is passed through an acidified K₂Cr₂O₇ solution, the colour of the solution:

will remain unchanged

will change to deep red

will change to dark green

will change to dark brown

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every Redox Reactions question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.