In the reaction, ${\rm{C}}{{\rm{H}}_3}{\rm{OH}} \to {\rm{HCOOH}}$, the number of electrons that must be added to the right is:

JEE CHEMISTRY MCQ: REDOX REACTIONS

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Application +4 | -1

In the reaction,

\mathrm{C}{\mathrm{H}_3}\mathrm{OH} \to \mathrm{HCOOH}

, the number of electrons that must be added to the right is:

View answer and explanation

Correct option: A

Option A (4) is correct because the oxidation state of carbon changes from -2 to +2, requiring 4 electrons to be added to the right side of the equation.

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 :