JEE CHEMISTRY MCQ: REDOX REACTIONS

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Given

E^{\Theta}

(i)

{Mg}^{2+} / {Mg}({s}), {E}^{\Theta}=-2.36

(ii)

{Ag}^{+} / {Ag}

(s),

{E}^{\Theta}=0.80

(iii)

{Al}^{3+} / {Al}({s}), {E}^{\Theta}=-1.66

(iv)

{Cu}^{2+} / {Cu}

(s),

{E}^{\Theta}=0.52

Out of the above given elements which is the strongest oxidising agent and which is the weakest oxidising agent ?

View answer and explanation

Correct option: B

(ii) is the strongest whereas (i) is the weakest oxidising agent

Option B is correct because the strongest oxidizing agent has the highest reduction potential, and the weakest has the lowest. Ag+/Ag has the highest, and Mg2+/Mg has the lowest.

More Questions from REDOX REACTIONS

Practice All Chapter MCQs →

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 :