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Why is BiH3 the strongest reducing agent...

Why is `BiH_3` the strongest reducing agent amongst all the hydrides of group 15 elements?

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Doen the group `(darr)` i.e, from N to Bi, the atomic size increases, hence the bond length `A-H` increases consequently `A-H` bond strength decreases and tendency to behave as reducing agent increases i.e., `BiH_3` is the strongest reducing agent amongst all the hydrides of group 15 elements.
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Knowledge Check

  • The strongest reducing agent amongst all the hydrides of Group 15 element is

    A
    `BiH_(3)`
    B
    `PH_(3)`
    C
    `NH_(3)`
    D
    `AsH_(3)`

  • The strongest reducing agent is

    A
    `HNO_(3)`
    B
    `H_(2)S`
    C
    `H_(2)SO_(3)`
    D
    `SnCl_(2)`

  • The strongest reducing agent is

    A
    `Cl_(2)`
    B
    `Cl^(-)`
    C
    `Br^(-)`
    D
    `I^(-)`

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