d and f Block Elements NEET PYQs ā€“ Chapter-wise MCQs with Answers

d- and f-Block Elements NEET Previous Year Questions (PYQs)

Practice NEET previous year questions from d- and f-Block Elements. These chapter-wise MCQs include answers and clear explanations for strong conceptual understanding.

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d and f Block Elements Chapter Notes

Q1. Which one of the following ions exhibits both dā€“d transition and paramagnetism?

(NEET 2018)

  • (A) Sc3+
  • (B) Zn2+
  • (C) Cu2+
  • (D) Ti4+
Show Answer

(C)

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Cu2+ has one unpaired electron in d-orbital, hence shows colour and paramagnetism.

Q2. The manganate and permanganate ions are tetrahedral due to:

(NEET 2019)

  • (A) pĻ€ā€“dĻ€ bonding between O and Mn
  • (B) pĻ€ā€“pĻ€ bonding
  • (C) absence of Ļ€-bonding
  • (D) dĻ€ā€“dĻ€ bonding
Show Answer

(A)

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Ļ€-bonding occurs by overlap of p-orbitals of oxygen with d-orbitals of manganese.

Q3. Name the gas that readily decolourises acidified KMnO4 solution.

(NEET 2017)

  • (A) SO2
  • (B) NO2
  • (C) CO2
  • (D) P2O5
Show Answer

(A)

Show Explanation

SO2 acts as a reducing agent and decolourises KMnO4.

Q4. The greater range of oxidation states in actinoids is due to:

(NEET 2017)

  • (A) Actinoid contraction
  • (B) Comparable energies of 5f, 6d and 7s orbitals
  • (C) Radioactive nature
  • (D) Strong metallic bonding
Show Answer

(B)

Show Explanation

Small energy gap between 5f, 6d and 7s orbitals allows participation of more electrons in bonding.

Q5. Which lanthanoid ion is diamagnetic?

(NEET 2013)

  • (A) Ce3+
  • (B) Eu2+
  • (C) La3+
  • (D) Nd3+
Show Answer

(C)

Show Explanation

La3+ has 4f0 configuration and no unpaired electrons.

Q6. Which pair of elements has nearly the same atomic radii due to lanthanoid contraction?

(NEET 2015)

  • (A) Zr and Nb
  • (B) Zr and Hf
  • (C) Ti and Zr
  • (D) Nb and Ta
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(B)

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Lanthanoid contraction makes atomic radii of Zr and Hf almost identical.

Q7. Magnetic moment 2.83 BM corresponds to:

(NEET 2014)

  • (A) Ti3+
  • (B) Ni2+
  • (C) Cr3+
  • (D) Mn2+
Show Answer

(B)

Show Explanation

2.83 BM indicates two unpaired electrons, as in Ni2+.

Q8. Which one is NOT a property of interstitial compounds?

(NEET 2013)

  • (A) High melting point
  • (B) Hardness
  • (C) Chemical inertness
  • (D) High chemical reactivity
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(D)

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Interstitial compounds are generally chemically inert.

Q9. Which metal exhibits the maximum number of oxidation states?

(NEET 2002)

  • (A) Cr
  • (B) Fe
  • (C) Mn
  • (D) V
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(C)

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Manganese shows oxidation states from +2 to +7.

Q10. Which alloy contains a non-metal as one of its constituents?

(NEET 2012)

  • (A) Invar
  • (B) Steel
  • (C) Bronze
  • (D) Bell metal
Show Answer

(B)

Show Explanation

Steel is an alloy of iron with carbon (a non-metal).

Q11. Which ion will be colourless in aqueous solution?

(NEET 2005)

  • (A) Fe3+
  • (B) Cu2+
  • (C) Zn2+
  • (D) Ni2+
Show Answer

(C)

Show Explanation

Zn2+ has completely filled d-orbitals and no dā€“d transitions.

Q12. Which oxidation state is most common among lanthanoids?

(NEET 2010)

  • (A) +2
  • (B) +3
  • (C) +4
  • (D) +5
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(B)

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+3 oxidation state is most stable due to loss of 6s electrons.

Q13. The catalytic activity of transition metals is mainly due to:

(NEET 2003)

  • (A) Magnetic nature
  • (B) High density
  • (C) Variable oxidation states
  • (D) Colour
Show Answer

(C)

Show Explanation

Transition metals form unstable intermediates due to variable oxidation states.

Q14. Which compound has zero oxidation state of the metal?

(NEET 1999)

  • (A) FeSO4
  • (B) FeCl3
  • (C) Fe(CO)5
  • (D) Fe2O3
Show Answer

(C)

Show Explanation

In metal carbonyls, oxidation state of metal is zero.

Q15. Lanthanoid contraction occurs due to:

(NEET 2014)

  • (A) Poor shielding by f-orbitals
  • (B) High electronegativity
  • (C) Large atomic size
  • (D) Metallic bonding
Show Answer

(A)

Show Explanation

f-orbitals shield nuclear charge poorly, causing contraction.

Q16. Which transition metal ion shows maximum paramagnetism?

(NEET)

  • (A) Fe2+
  • (B) Mn2+
  • (C) Co2+
  • (D) Ni2+
Show Answer

(B)

Show Explanation

Mn2+ has five unpaired electrons.

Q17. Which metal is liquid at room temperature?

(NEET 1995)

  • (A) Gallium
  • (B) Cesium
  • (C) Mercury
  • (D) Sodium
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(C)

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Mercury has weak metallic bonding and remains liquid.

Q18. Which ion gives colour in aqueous solution?

(NEET 2010)

  • (A) Sc3+
  • (B) Zn2+
  • (C) Cu2+
  • (D) Cd2+
Show Answer

(C)

Show Explanation

Cu2+ has unpaired electrons allowing dā€“d transitions.

Q19. The most durable method to protect iron from corrosion is:

(NEET 2001)

  • (A) Copper plating
  • (B) Zinc plating
  • (C) Tin plating
  • (D) Nickel plating
Show Answer

(B)

Show Explanation

Zinc acts as sacrificial anode and protects iron.

Q20. Which element is responsible for oxidation of water in photosynthesis?

(NEET 1997)

  • (A) Cu
  • (B) Fe
  • (C) Mn
  • (D) Mo
Show Answer

(C)

Show Explanation

Manganese plays a key role in water oxidation during photosynthesis.

šŸ‘‰ More d- and f-Block Elements NEET PYQs will be added gradually.

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