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Which given d- or f-block ions are coloured or colourless

This type of question, asked 5 times: 2021 Paper 13, 29 Jul 2022, 9 Apr 2024, 28 Jan 2026 S1, 8 Apr 2026 S2. All 5 questions below, oldest first.

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  1. Question 1

    2021 Paper 13

    37
    Which of the following pairs of ions is paramagnetic as well as coloured?

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  2. Question 2

    29 Jul 2022

    39
    In following pairs, the one in which both transition metal ions are colourless is:

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  3. Question 3

    9 Apr 2024

    60
    Number of colourless lanthanoid ions among the following is______
    Eu3+,Lu3+,Nd3+,La3+,Sm3+Eu^{3 +},Lu^{3 +},Nd^{3 +},La^{3 +},Sm^{3 +}

  4. Question 4

    28 Jan 2026 S1

    43
    Given below are two statements : Statement I: The number of pairs, following, in which both the ions are coloured in aqueous solution is 3. [  Sc3+,Ti3+],[Mn2+,Cr2+],[Cu2+,Zn2+]\left. \ {Sc}^{3 +},{Ti}^{3 +} \right\rbrack,\left\lbrack {Mn}^{2 +},{Cr}^{2 +} \right\rbrack,\left\lbrack {Cu}^{2 +},{Zn}^{2 +} \right\rbrack and [Ni2+,Ti4+]\lbrack{Ni}^{2 +},{Ti}^{4 +}\rbrack Statement II : Th4+{Th}^{4 +} is the strongest reducing agent among Th4+,Ce4+,Gd3+{Th}^{4 +},{Ce}^{4 +},{Gd}^{3 +} and Eu2+{Eu}^{2 +}. In the light of the above statements, choose the correct answer from the options given below:

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  5. Question 5

    8 Apr 2026 S2

    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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