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Stability, basicity and reducing power of group 15 hydrides

This type of question, asked 7 times: 2021 Paper 5, 2021 Paper 13, 30 Jan 2024, 1 Feb 2024, 28 Jan 2025, 28 Jan 2026 S1, 8 Apr 2026 S2. All 8 questions below, oldest first.

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  1. Question 1

    2021 Paper 5

    50
    A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is:

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  2. Question 2

    2021 Paper 13

    34
    Which of the following is most reducing agent in group 15 elements?

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  3. Question 3

    30 Jan 2024

    139
    Choose the correct statements about the hydrides of group 15 elements. (A) The stability of the hydrides decreases in the order NH3>PH3>AsH3>SbH3>BiH3NH_{3}>PH_{3}>AsH_{3}>SbH_{3}>BiH_{3} (B) The reducing ability of the hydrides increases in the order NH3<PH3<AsH3<SbH3<BiH3NH_{3}<PH_{3}<AsH_{3}<SbH_{3}<BiH_{3} (C) Among the hydrides, NH3NH_{3} is strong reducing agent while BiH3BiH_{3} is mild reducing agent. (D) The basicity of the hydrides increases in the order NH3<PH3<AsH3<SbH3<BiH3NH_{3}<PH_{3}<AsH_{3}<SbH_{3}<BiH_{3} Choose the most appropriate from the option given below:

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  4. Question 4

    1 Feb 2024

    38
    Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : PH3PH_{3} has lower boiling point than NH3NH_{3}. Reason (R) : In liquid state NH3NH_{3} molecules are associated through vander waal's forces, but PH3PH_{3} molecules are associated through hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below:

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  5. Question 5

    1 Feb 2024

    126
    The strongest reducing agent among the following is:

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  6. Question 6

    28 Jan 2025

    124
    A group 15 element forms dπ−dπd\pi - d\pi bond with transition metals. It also forms hydride, which is a strongest base among the hydrides of other group members that form dπ−dπd\pi - d\pi bond. The atomic number of the element is_____

  7. Question 7

    28 Jan 2026 S1

    36
    Regarding the hydrides of group 15 elements EH3EH_{3} (E = N, P, As, Sb), select the correct statement from the following: (A) The stability of hydrides decreases down the group. (B) The basicity of hydrides decreases down the group. (C) The reducing character increases down the group. (D) The boiling point increases down the group. Choose the correct answer from the options given below:

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  8. Question 8

    8 Apr 2026 S2

    34
    Find the correct statements related to group 15 hydrides. (A) Reducing nature increases from NH3{NH}_{3} to BiH3{BiH}_{3} (B) Tendency to donate lone pair of electrons decreases from NH3{NH}_{3} to BiH3{BiH}_{3} (C) The stability of hydrides decreases from NH3{NH}_{3} to BiH3{BiH}_{3} (D) HEH bond angle decreases from NH3{NH}_{3} to SbH3{SbH}_{3} ( E=E = Elements of group 15) Choose the correct answer from the options given below :

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