Statement-I: Oxidation number of $\mathrm{Ni}$ in $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ is $+2.$ Statement-II: Nickel is bonded to neutral ligand, carbonyl.

Both the statements are correct

Both the statements are incorrect

Statement-I is correct but statement-II is incorrect

Back to REDOX REACTIONS

JEE CHEMISTRY MCQ: REDOX REACTIONS

1 Medium

1 of 1

Understanding +4 | -1

Statement-I: Oxidation number of

\mathrm{Ni}

\left[\mathrm{Ni}(\mathrm{CO})_4\right]

+2.

Statement-II: Nickel is bonded to neutral ligand, carbonyl.

View answer and explanation

Correct option: D

Statement-I is incorrect but statement-II is correct

The correct answer is D (Statement-I is incorrect but statement-II is correct) because the oxidation number of Ni in [Ni(CO)4] is 0, not +2, and CO is a neutral ligand.

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 :