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The d- and f-Block Elements

JEE Mains Chemistry. Try each one first, then open its answer.

Top 10 JEE Mains PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    This type asked 8 times: 2021 Paper 7, 2021 Paper 15, 25 Jun 2022, 25 Jan 2023, 27 Jan 2024, 24 Jan 2025, 3 Apr 2025, 4 Apr 2025. This one: 4 Apr 2025 See all 8 of this type

    44
    Pair of transition metal ions having the same number of unpaired electrons is:

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  2. Question 2

    This type asked 8 times: 2021 Paper 3, 2021 Paper 5, 25 Jun 2022, 24 Jan 2023, 6 Apr 2023, 27 Jan 2024, 29 Jan 2024, 24 Jan 2025. This one: 24 Jan 2025 See all 8 of this type

    31
    Which of the following ions is the strongest oxidizing agent? (Atomic Number of Ce=58,Eu=63, Tb=65,Lu=71Ce = 58,Eu = 63,\text{ }Tb = 65,Lu = 71)

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  3. Question 3

    This type asked 6 times: 24 Jan 2023, 25 Jan 2023, 28 Jan 2025, 23 Jan 2026 S2, 24 Jan 2026 S1, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 6 of this type

    36
    Which of the following sets includes all the species that will change the orange colour of K2Cr2O7K_{2}Cr_{2}O_{7} in acidic medium?

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  4. Question 4

    This type asked 6 times: 8 Apr 2023, 15 Apr 2023, 29 Jan 2024, 31 Jan 2024, 21 Jan 2026 S1, 21 Jan 2026 S2. This one: 21 Jan 2026 S2 See all 6 of this type

    45
    On heating a mixture of common salt and K2Cr2O7K_{2}Cr_{2}O_{7} in equal amount along with concentrated H2SO4H_{2}SO_{4} in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are :

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  5. Question 5

    This type asked 6 times: 2021 Paper 20, 31 Jan 2023, 31 Jan 2024, 28 Jan 2025, 4 Apr 2025, 7 Apr 2025. This one: 7 Apr 2025 See all 6 of this type

    39
    The first transition series metal ' MM ' has the highest enthalpy of atomisation in its series. One of its aquated ion ( Mn+M^{n +} ) exists in green colour. The nature of the oxide formed by the above Mn+M^{n +} ion is :

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  6. Question 6

    This type asked 6 times: 2021 Paper 3, 2021 Paper 24, 29 Jun 2022, 27 Jan 2024, 30 Jan 2024, 22 Jan 2025. This one: 22 Jan 2025 See all 6 of this type

    122
    Niobium ( Nb ) and ruthenium ( Ru ) have " x " and " yy " number of electrons in their respective 4d4d orbitals. The value of x+yx + y is ______\_\_\_\_\_\_

  7. Question 7

    This type asked 6 times: 25 Jun 2022, 25 Jul 2022, 29 Jan 2023, 10 Apr 2023, 1 Feb 2024, 5 Apr 2024. This one: 5 Apr 2024 See all 6 of this type

    137
    The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ________ . Ti2+,Cr2+Ti^{2 +},Cr^{2 +} and V2+V^{2 +}

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  8. Question 8

    This type asked 5 times: 2021 Paper 13, 29 Jul 2022, 9 Apr 2024, 28 Jan 2026 S1, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 5 of this type

    35
    Given below are two statements : Statement I : The number of pairs among [Ti4+,V2+],[V2+,Mn2+],[Mn2+,Fe3+]\left\lbrack {Ti}^{4 +},V^{2 +} \right\rbrack,\left\lbrack V^{2 +},{Mn}^{2 +} \right\rbrack,\left\lbrack {Mn}^{2 +},{Fe}^{3 +} \right\rbrack and [V2+,Cr2+]\left\lbrack V^{2 +},{Cr}^{2 +} \right\rbrack in which both ions are coloured is 3 . Statement II : The number pairs among [ La3+{La}^{3 +},  Yb2+],[Lu3+,Ce4+]\left. \ {Yb}^{2 +} \right\rbrack,\left\lbrack {Lu}^{3 +},{Ce}^{4 +} \right\rbrack and [Ac3+,Lr3+]\left\lbrack {Ac}^{3 +},{Lr}^{3 +} \right\rbrack ions in which both are diamagnetic is 3 . In the light of the above statements, choose the correct answer from the option given below :

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  9. Question 9

    This type asked 5 times: 2021 Paper 20, 31 Jan 2023, 27 Jan 2024, 9 Apr 2024, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 5 of this type

    34
    Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number, Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72] (A) (Eu and Gd) (B) (Dy and Ho) (C) ( Yb and Hf ) (D) ( Lu and Tm) Choose the correct answer from the options given below:

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  10. Question 10

    This type asked 5 times: 2021 Paper 17, 2021 Paper 23, 25 Jan 2023, 30 Jan 2023, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 5 of this type

    44
    Among Fe3+,Pb2+,Cu2+Fe^{3 +},Pb^{2 +},Cu^{2 +} and Mn2+Mn^{2 +}, identify the one that gets precipitated out while passing H2 SH_{2}\text{ }S in presence of NH4OHNH_{4}OH as group reagent. The highest possible oxidation state of the corresponding metal is

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