Which is a stronger reducing agent, $S b H_{3}$ or $B i H_{3}$ , and why?

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Solution

$B i H_{3}$ is strong reducing agent because good reducing agent is the substance which can donate hydrogen atom easily.
As we move down in a particular group, the size of the atom increase so the bond length between the atom and hydrogen increase so the bond strength decreases,hence it can loose hydrogen easily.
So, the reducing nature hydrides of the VA group is given as $B i H_{3} > S b H_{3} > A s H_{3} > P H_{3} N H_{3}$ .

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