JEE CHEMISTRY MCQ: REDOX REACTIONS

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Analyzing +4 | -1

Following reaction describes the rusting of iron,

4 \mathrm{Fe}+3 \mathrm{O}_2 \rightarrow 4 \mathrm{Fe}^{3+}+6 \mathrm{O}^{2-}.

Which the following statements is(are) correct?

(A) This is an example of a redox reaction

(B) Metallic iron is reduced to

\mathrm{Fe}^{3+}

(C)

\mathrm{Fe}^{3+}

is an oxidizing agent

(D) Metallic iron is reducing agent

View answer and explanation

Correct option: C

A, C and D

The correct answer is A (A, C and D) because rusting of iron is a redox reaction where iron is oxidized and acts as a reducing agent, while Fe3+ formed can act as an oxidizing agent.

More Questions from REDOX REACTIONS

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The oxidation number of

\mathrm{H}

in sodium hydride is A reagent, which can decrease the oxidation number of an element, is called Consider the following decomposition reaction

2 \mathrm{KClO}_3 \longrightarrow 2 \mathrm{KCl}+3 \mathrm{O}_2

In the above reaction, Assertion (A):

\mathrm{HNO}_3

acts as oxidizing agent.

Reason (R): Oxidation no. of nitrogen is +5, no increase in oxidation no. beyond +5 can occur. The oxidation no. of

\mathrm{HNO}_3

can only decrease. Assertion :- Bromide ion is serving as a reducing agent in the reaction.

\mathrm{MnO}_4^{-}(\mathrm{aq})+\mathrm{Br}^{-}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{MnO}_2(\mathrm{aq})+\mathrm{BrO}_3^{-}(\mathrm{aq})+2 \mathrm{OH}^{-}(\mathrm{aq})

Reason :- Oxidation number of

\mathrm{Br}

increases from

-1

+5.

A substance, that by its sharp colour change indicates the completion of reaction is known as :