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Why nitrogen cannot expand its covalency beyond four

This type of question, asked 6 times: 14 Jun 2022, 8 Apr 2024, 22 Jan 2025, 4 Apr 2025, 22 Jan 2026 S1, 5 Apr 2026 S1. All 6 questions below, oldest first.

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  1. Question 1

    14 Jun 2022

    130
    PCl5PCl_{5} is well known. but NCl5NCl_{5} is not. Because.

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  2. Question 2

    8 Apr 2024

    129
    Identify the incorrect statements about group 15 elements : (A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature. (B) The common oxidation states of these elements are −3,+3- 3, + 3 and +5 . (C) Nitrogen has unique ability to form pπ−pπp\pi-p\pi multiple bonds. (D) The stability of +5 oxidation states increases down the group. (E) Nitrogen shows a maximum covalency of 6 . Choose the correct answer from the options given below.

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  3. Question 3

    22 Jan 2025

    103
    The maximum covalency of a non-metallic group 15 element ' E ' with weakest E−EE - E bond is :

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  4. Question 4

    4 Apr 2025

    37
    Given below are two statements : Statement I : Nitrogen forms oxides with +1 to +5 oxidation states due to the formation of pπ−pπp\pi - p\pi bond with oxygen . Statement II : Nitrogen does not form halides with +5 oxidation state due to the absence of d-orbital in it. In the light of given statements, choose the correct answer from the options given below.

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  5. Question 5

    22 Jan 2026 S1

    39
    Given below are two statements : Statement I: The halogen that makes longest bond with hydrogen in HX, has the smallest covalent radius in its group. Statement II : A group 15 element's hydride EH3{EH}_{3} has the lowest boiling point among corresponding hydrides of other group 15 elements. The maximum covalency of that element E is 4 . In the light of the above statements, choose the correct answer from the options given below.

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  6. Question 6

    5 Apr 2026 S1

    34
    Correct statements from the following are : (A) Nitrogen in oxidation states from +1 to +4 disproportionate in acid medium. (B) Nitrogen has the ability of form dπ−pπd\pi - p\pi multiple bonds with itself and other elements with small size and high electronegativity. (C) N-N single bond is stronger than P-P single bond. (D) Nitrogen has highest density in its group due to small size. (E) The maximum covalency of nitrogen is four since it has only four valence orbitals for bonding. Choose the correct answer from the options given below :

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