The d- and f-Block Elements

Bihar Board Class 12 · Chemistry · 31 past questions

1. Q1 2026 Set A

   If the electronic configuration of a transition element in its +3 oxidation state is [Ar]3d$^4$, then its…

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2. Q2 2026 Set A

   The most common oxidation state of lanthanide elements is

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3. Q3 2025 Set D2022 Set E

   Which of the following ions is diamagnetic ?

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4. Q4 2025 Set D

   Lutetium (Lu) is

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5. Q5 2025 Set D

   Elements of which atomic numbers belong to $3d$ transition series ?

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6. Q6 2025 Set D

   The electronic configuration of copper ( Z = 29 ) is

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7. Q7 2025 Set D

   Which of the following is the electronic configuration of Lanthanide elements ?

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8. Q8 2025 Set D

   Which of the following compounds can be coloured ?

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9. Q9 2024 Set D

   Which of the following has maximum number of unpaired electrons ?

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10. Q10 2024 Set D

    The maximum oxidation state of chromium is

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11. Q11 2024 Set D

    The number of unpaired electrons in $Cu^{2+}$ ion ( Z = 29 ) is

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12. Q12 2023 Set F

    Which of the following ions of transition elements is paramagnetic ?

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13. Q13 2023 Set F

    Which of the following is called coinage metals ?

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14. Q14 2023 Set F

    Which of the following is a member of first transition series ?

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15. Q15 2023 Set F

    The electronic configuration of Cu$^{2+}$ (Z = 29) is

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16. Q16 2022 Set E

    Magnesium is an important component of which biomolecule ?

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17. Q17 2022 Set E

    The general electronic configuration of transition elements is

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18. Q18 2022 Set E

    In which of the following is the oxidation state of Mn lowest ?

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19. Q19 2022 Set E

    Which of the following is not an actinide ?

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20. Q20 2022 Set E

    Which of the following ions is colourless ?

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21. Q21 2021 Set A

    The element showing highest oxidation state among first transition series is

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22. Q22 2021 Set A

    In which of the following elements $4f$ energy level is gradually filled?

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23. Q23 2019 Set D

    Transition elements are also known as -

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24. Q24 2018

    Which of the following has the most stable +2 oxidation state?

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25. Q25 2018

    Copper sulphate solution on treatment with excess of KI gives whitish precipitate. The precipitate is-

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26. Q26 2017

    The general electronic configuration shown by the transition metal is -

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27. Q27 2017

    The highest magnetic moment shown by transition metal ion with the outermost electronic configuration is-

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28. Q28 2016

    Outermost configuration $3d^6 4s^2$ is of

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29. Q29 2016

    Transition elements form coloured compound. Explain.

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30. Q30 2015

    Which one of the following is called green vitriol?

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31. Q31 2015

    Which block of elements are known as transition elements?

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