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Number of lone pairs on the central atom of given species

This type of question, asked 10 times: 2021 Paper 11, 2021 Paper 20, 26 Jun 2022, 29 Jun 2022, 25 Jul 2022, 30 Jan 2023, 8 Apr 2023, 11 Apr 2023, 29 Jan 2024, 7 Apr 2025. All 10 questions below, oldest first.

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  1. Question 1

    2021 Paper 11

    30
    Number of lone pairs on central atom in I3−I_{3}^{-}

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  2. Question 2

    2021 Paper 20

    33
    Match List-I with List-II:
    List-I (Species)List-II (Number of lone pairs of electrons on the central atom)
    (A)XeF2XeF_{2}(i)0
    (B)XeO2F2XeO_{2}F_{2}(ii)1
    (C)XeO3F2XeO_{3}F_{2}(iii)2
    (D)XeF4XeF_{4}(iv)3
    Choose the most appropriate answer from the options given below:

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  3. Question 3

    26 Jun 2022

    143
    Amongst SF4,XeF4,CF4SF_{4},XeF_{4},CF_{4} and H2OH_{2}O, the number of species with two lone pairs of electrons

  4. Question 4

    29 Jun 2022

    130
    Number of lone pair (s) of electrons on central atom and the shape of BrF3BrF_{3} molecule respectively, are:

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  5. Question 5

    25 Jul 2022

    146
    The sum of number of lone pairs of electrons present on the central atoms of XeO3,XeOF4XeO_{3},XeOF_{4} and XeF6XeF_{6} is

  6. Question 6

    30 Jan 2023

    45
    Match List I with List II
    LIST I (Species)LIST II (No. of lone pairs of e−e^{-} on the central atom)
    A.
    IF7IF_{7}
    		I.Three
    B.
    ICl4−ICl_{4}^{-}
    		II.One
    C.
    XeF6XeF_{6}
    		III.Two
    D.
    XeF2XeF_{2}
    		IV.Zero
    Choose the correct answer from the options given below:

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  7. Question 7

    8 Apr 2023

    145
    The number of species from the following carrying a single lone pair on central atom Xenon is_____ XeF5+,XeO3,XeO2 F2,XeF5−,XeO3 F2,XeOF4XeF_{5}^{+},XeO_{3},XeO_{2}{\text{ }F}_{2},XeF_{5}^{-},XeO_{3}{\text{ }F}_{2},XeOF_{4}, XeF4XeF_{4}

  8. Question 8

    11 Apr 2023

    148
    The maximum number of lone pairs of electrons on the central atom from the following species is__ ClO3 −,XeF4,SF4ClO_{3}\ ^{-},XeF_{4},SF_{4} and I3−I_{3}^{-}

  9. Question 9

    29 Jan 2024

    51
    Number of compounds with one lone pair of electrons on central atom amongst following is___ O3,H2O,SF4,ClF3,NH3,BrF5,XeF4O_{3},H_{2}O,SF_{4},ClF_{3},NH_{3},BrF_{5},XeF_{4}

  10. Question 10

    7 Apr 2025

    41
    Match the LIST-I with LIST-II.
    LIST-I (Molecule/ion)LIST-II (Bond pairs : lone pairs on the central atom)
    A.
    ICl2−{ICl}_{2}^{-}
    		I.4:2
    B.
    H2OH_{2}O
    		II.4:1
    C.
    SO2{SO}_{2}
    		III.2 : 3
    D.
    XeF4{XeF}_{4}
    		IV.2 : 2
    Choose the correct answer from the options given below:

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