The d- and f-Block Elements

CBSE Class 12 · Chemistry · 23 past questions

1. Q1 2026

   Electronic configuration of chromium is…

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2. Q2 2026

   For question number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled…

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3. Q3 2026

   Which of the following is not a transition metal ?

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4. Q4 2026

   In aqueous solution, $Cr_2O_7^{2-}$ ion converts to which of the following in alkaline medium ?

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5. Q5 2026

   For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other…

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6. Q6 2025

   Out of $Fe^{3+}$, $Sc^{3+}$, $Cr^{3+}$ and $Co^{3+}$ ions, the one which is colourless in aqueous solution is…

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7. Q7 2025

   Out of the following statements, the *incorrect* statement is…

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8. Q8 2025

   The product of the oxidation of I$^-$ with MnO$_4^-$ in alkaline medium is…

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9. Q9 2025

   For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other…

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10. Q10 2025

    The element having $[Ar]3d^{10}4s^1$ electronic configuration is

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11. Q11 2025

    Complete and balance the following chemical equations…

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12. Q12 2025

    The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only…

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13. Q13 2025

    Acidified $KMnO_4$ oxidises sulphite to

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14. Q14 2025

    The elements of 3d transition series are given as…

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15. Q15 2024

    When MnO2 is fused with KOH in air, it gives…

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16. Q16 2024

    Which of the following does not show variable oxidation states?

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17. Q17 2024

    Which one of the following first row transition elements is expected to have the highest third ionization…

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18. Q18 2024

    For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other…

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19. Q19 2023

    Which of the following characteristics of transition metals is associated with their catalytic activity ?

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20. Q20 2023

    Among the following outermost configurations of transition metals which one shows the highest oxidation state…

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21. Q21 2023

    For Questions number 15 to 18, two statements are given — one labelled as Assertion (A) and the other…

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22. Q22 2023

    The most common and stable oxidation state of a Lanthanoid is…

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23. Q23 2023

    Complete the following equations…

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