D & f- BLOCK ELEMENTS practice · Mixed difficulty

Choose an answer to check it, or open “View answer” to study the explanation. Sign in to save progress to your account.

Practice format and chapter quiz

The practice player uses single-correct-answer MCQs. Chapter quizzes help you review a topic; they are not full-length NEET mock papers.

Showing 211-213 of 213 questions

Preparing practice and saved progress…

211 Medium

211 of 213

Understanding +4 | -1

The reaction

\mathrm{MnO}_4^ - + e \to \mathrm{MnO}_4^{2 - }

takes place in:

View answer and explanation

Correct option: A

Basic medium

Option A (Basic medium) is correct because the reduction of

MnO_4^-

MnO_4^{2-}

is favored in a basic medium.

212 Easy

212 of 213

Application +4 | -1

In chromite ore, the oxidation number of iron and chromium are respectively.

View answer and explanation

Correct option: D

+ 2, + 3

Option D is correct because in chromite ore (FeCr2O4), iron has a +2 oxidation state and chromium has a +3 oxidation state.

213 Medium

213 of 213

Analyzing +4 | -1

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order?

View answer and explanation

Correct option: B

Mn > Fe > Cr > Co

Option B (Mn > Fe > Cr > Co) is correct because the stability of the +2 oxidation state is related to achieving stable electronic configurations.

Revision notes and key takeaways

Review d & f- BLOCK ELEMENTS in your textbook or class notes, then use this set to check your understanding.

Showing 211-213 of 213 questions

Continue Your Practice