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The following are some statements related to VA group hydrides.
I.    Reducing property increases from $N H_{3}$ to $B i H_{3}$
II.   Tendency to donate lone pair decreases from $N H_{3}$ to $B i H_{3}$
III.  Thermal stability of hydrides decreases from $N H_{3}$ to $B i H_{3}$
IV.   Bond angle of hydrides decreases from $N H_{3}$ to $B i H_{3}$
The correct statements are

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I and IV

I, II, III and IV

I, III and IV

I, II and IV

answer is A.

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Detailed Solution

Reducing property $\infty \frac{1}{thermal stability}$

Tendency to donate lone pair $\infty$ Lewis basic nature

Thermal stability $\infty$ $\frac{1}{M - H bond length}$

Bond angle $\infty \frac{1}{size of central atom}$ (for same type of compounds of same group with similar type of electronic repulsions)

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