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NEET UG d- and f-Block Elements — practice questions

Explore 94 free d- and f-Block Elements questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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d- and f-Block Elements questions and exercises with answers

Showing questions 1–30 of 94.

The general outer electronic configuration of d-block elements is:Read the answer and worked solution →The electronic configuration of Cr (Z = 24) is:Read the answer and worked solution →Which 3d transition element exhibits the largest number of oxidation states?Read the answer and worked solution →The most stable oxidation state of Sc is:Read the answer and worked solution →The spin-only magnetic moment μ in BM for n unpaired electrons is given by:Read the answer and worked solution →Calculate the spin-only magnetic moment of a divalent ion of Mn (Z = 25):Read the answer and worked solution →Which of the following ions is colourless and diamagnetic?Read the answer and worked solution →The oxidation state of chromium in both CrO₄²⁻ and Cr₂O₇²⁻ is:Read the answer and worked solution →Potassium dichromate (K₂Cr₂O₇) is prepared from which ore?Read the answer and worked solution →In KMnO₄, the oxidation state of Mn is:Read the answer and worked solution →The most common oxidation state of lanthanoids is:Read the answer and worked solution →Which lanthanoid is well known to exhibit the +4 oxidation state in aqueous solution as a strong oxidising agent?Read the answer and worked solution →The general electronic configuration of actinoids is:Read the answer and worked solution →Which of the following ions is NOT coloured in aqueous solution?Read the answer and worked solution →Among Sc²⁺, V³⁺, Mn²⁺ and Zn²⁺, which is paramagnetic with **5** unpaired electrons?Read the answer and worked solution →The lanthanoid series is built up by the filling of which orbitals?Read the answer and worked solution →Under the IUPAC definition, a transition metal has an incomplete d subshell in which species?Read the answer and worked solution →Which 4d element has the outer configuration 4d10 5s0?Read the answer and worked solution →Scandium (Z = 21) counts as a transition element because its ground-state atom has what?Read the answer and worked solution →Silver atoms have a full 4d subshell. Why is silver still a transition element?Read the answer and worked solution →What accounts for the high melting points of transition metals?Read the answer and worked solution →In a transition row, melting points generally peak near which d configuration?Read the answer and worked solution →Transition metals with very high enthalpies of atomisation tend to behave how?Read the answer and worked solution →Why do 4d and 5d metals often form metal-metal bonds?Read the answer and worked solution →What favours the mid-series peak in atomisation enthalpy?Read the answer and worked solution →Why do same-charge ions shrink across a d series?Read the answer and worked solution →Zirconium and hafnium have almost the same atomic radius. Which effect causes this?Read the answer and worked solution →How does density change from titanium to copper in the 3d series?Read the answer and worked solution →How does the change in ionisation enthalpy along a transition series compare with a non-transition period?Read the answer and worked solution →When a d-block element forms a cation, which electrons are removed first?Read the answer and worked solution →

Worked practice questions

The general outer electronic configuration of d-block elements is:

  1. nd¹⁻¹⁰ (n+1)s¹⁻²
  2. (n−1)d⁰ ns²
  3. (n−1)d¹⁻¹⁰ ns¹⁻²
  4. ns¹⁻² np¹⁻⁶
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Correct answer: C. (n−1)d¹⁻¹⁰ ns¹⁻²

**(n−1)d¹⁻¹⁰ ns¹⁻²** (except Pd, 4d¹⁰5s⁰). The penultimate d orbital is progressively filled across each row ns has 1–2 electrons.

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The electronic configuration of Cr (Z = 24) is:

  1. [Ar] 3d³ 4s³
  2. [Ar] 3d⁵ 4s¹
  3. [Ar] 3d⁶ 4s⁰
  4. [Ar] 3d⁴ 4s²
Show answer and solution

Correct answer: B. [Ar] 3d⁵ 4s¹

**Cr: [Ar] 3d⁵ 4s¹** (not 3d⁴ 4s²). The half-filled 3d⁵ + half-filled 4s¹ configuration provides **extra stability** from exchange energy and symmetry. **Similar exception in Cu:** 3d¹⁰ 4s¹ (not 3d⁹ 4s²).

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Which 3d transition element exhibits the largest number of oxidation states?

  1. Zn (only +2)
  2. Sc (only +3)
  3. Fe (+2 and +3)
  4. Mn — +2, +3, +4, +5, +6, +7 (six states; widest range)
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Correct answer: D. Mn — +2, +3, +4, +5, +6, +7 (six states; widest range)

**Manganese** exhibits the **widest range of oxidation states (+2 to +7)** in the 3d series. This is because Mn has 7 (3d⁵ 4s²) valence electrons available and is in the middle of the series. The early (Sc, Ti) and late (Cu, Zn) members have fewer states.

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