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Paramagnetic species or unpaired electrons from MO theory

This type of question, asked 9 times: 2021 Paper 23, 2021 Paper 24, 25 Jul 2022, 28 Jul 2022, 29 Jan 2024, 4 Apr 2024, 9 Apr 2024, 28 Jan 2025, 4 Apr 2025. All 9 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2021 Paper 23

    59
    According to molecular orbital theory, the number of unpaired electron(s) in O22−O_{2}^{2 -} is:

  2. Question 2

    2021 Paper 24

    58
    The spin-only magnetic moment value of B2+B_{2}^{+} species is ×10−2BM\times10^{- 2}BM. (Nearest integer) [Given: 3=1.73\sqrt{3}= 1.73 ]

  3. Question 3

    25 Jul 2022

    51
    Among the following species
    N2, N2 +,N2−,N2 2−,O2,O2+,O2−,O2 2−N_{2},{\text{ }N}_{2}\ ^{+},N_{2}^{-},N_{2}\ ^{2 -},O_{2},O_{2}^{+},O_{2}^{-},O_{2}\ ^{2 -}
    the number of species showing diamagnetism is

  4. Question 4

    28 Jul 2022

    53
    The number of paramagnetic species among the following is B2,Li2,C2,C2−,O22−,O2+B_{2},Li_{2},C_{2},C_{2}^{-},O_{2}^{2 -},O_{2}^{+}and He2+He_{2}^{+}

  5. Question 5

    29 Jan 2024

    58
    The number of species from the following which are paramagnetic and with bond order equal to one is _____
    H2,He2+,O2+,N22−,O22−,F2,Ne2+,B2H_{2},He_{2}^{+},O_{2}^{+},N_{2}^{2 -},O_{2}^{2 -},F_{2},Ne_{2}^{+},B_{2}

  6. Question 6

    4 Apr 2024

    60
    Number of molecules/species from the following having one unpaired electron is _________ .
    O2,O2−1,NO,CN−1,O22−O_{2},O_{2}^{- 1},NO,CN^{- 1},O_{2}^{2 -}

  7. Question 7

    9 Apr 2024

    57
    The total number of species from the following in which one unpaired electron is present, is ____.
    N2,O2,C2−,O2−,O22−,H2+,CN−,He2+N_{2},O_{2},C_{2}^{-},O_{2}^{-},O_{2}^{2 -},H_{2}^{+},CN^{-},He_{2}^{+}

  8. Question 8

    28 Jan 2025

    125
    Total number of molecules/species from following which will be paramagnetic is ___\_\_\_ O2,O2+,O2−,NO,NO2,CO,K2[NiCl4]O_{2},O_{2}^{+},O_{2}^{-},NO,NO_{2},CO,K_{2}\left\lbrack NiCl_{4} \right\rbrack,
    [Co(NH3)6]Cl3, K2[Ni(CN)4]\left\lbrack Co\left( NH_{3} \right)_{6} \right\rbrack Cl_{3},{\text{ }K}_{2}\left\lbrack Ni(CN)_{4} \right\rbrack

  9. Question 9

    4 Apr 2025

    28
    Which of the following molecule(s) show/s paramagnetic behaviour? (A) O2O_{2} (B) N2N_{2} (C) F2F_{2} (D) S2S_{2} (E) Cl2Cl_{2} Choose the correct answer from the options given below :

    Tap an option to check your answer.