NEET Chemistry / AI question bank / NCERT Class 12 / d- and f-Block Elements
The d- and f-Block Elements: NEET questions with solutions
NEET tests the definition of a transition element, colour and spin-only magnetic moments from d-electron counts, oxidation-state and E° trends across the 3d series, the chemistry of K₂Cr₂O₇ and KMnO₄ in different media, and the lanthanoid contraction and its consequences. Marks are lost by counting electrons for the atom instead of the ion, by forgetting that permanganate behaves differently in neutral medium, and by mixing up Ce⁴⁺ (oxidant) with Eu²⁺ (reductant).
Also called: transition elements · lanthanides and actinides · d-block elements
Questions
10 questions / answers after you pick
- Q1Which of these aquated ions is colourless?
Formation of coloured ionsEasySingle correct
- Q2Zinc is placed in the d-block, yet it is not regarded as a transition element. Why?
Electronic configuration of d-block elementsEasySingle correct
- Q3As a result of the lanthanoid contraction, which pair of elements has almost identical atomic radii?
Lanthanoid contractionEasySingle correct
- Q4Which ion has a spin-only magnetic moment of about 3.87 BM?
Magnetic propertiesMediumSingle correct
- Q5Which 3d metal has a positive E°(M²⁺/M) value and therefore does not liberate hydrogen from dilute non-oxidising acids?
Trends in M²⁺/M standard electrode potentialsMediumSingle correct
- Q6When sodium hydroxide solution is added to an orange solution of potassium dichromate, the colour turns yellow. What change has occurred?
Potassium dichromateMediumSingle correct
- Q7Cr²⁺ and Mn³⁺ both have a d⁴ configuration, but they behave in opposite ways. Judge the Assertion (A) and the Reason (R) below.
Trends in M³⁺/M²⁺ electrode potentialsMediumAssertion–Reason
- Q8Most lanthanoids prefer the +3 state, but a few show +2 or +4. Which of the statements below are correct?
The lanthanoidsMediumStatement based
- Q9The product of an oxidation by permanganate or dichromate depends on the substrate and the medium. Match each reaction in List I with the…
Potassium permanganate and dichromateHardMatch the following
- Q10Which statement about the actinoids is INCORRECT?
The actinoidsHardSingle correct
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