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The least stable hydride of 15th group e...

The least stable hydride of 15th group elements is

A

a)`NH_(3)`

B

b)`PH_(3)`

C

c)`AsH_(3)`

D

d)`BiH_(3)`

Text Solution

Verified by Experts

The correct Answer is:
D
Thermal stability of hydrides of N family decreases gradually from `NH_(3)` to `BiH_(3)` due to increase in M-H bond strength down the group on account of increase in size of central atom.
`{:(,NH_(3),gt,PH_(3),gt,AsH_(3),gt,SbH_(3),gt,BiH_(3)),("Decomposit",1300^(@)C,,440^(@)C,,280^(@)C,,150^(@)C,,"Room"),("ion temp.:",,,,,,,,,"temp."):}`
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Knowledge Check

  • The least stable free radical is

    A
    `CH_(3)overset(.)CH_(2)`
    B
    `CH_(3)CH_(2)overset(.)CH_(2)`
    C
    `(CH_(3))_(2)overset(.)CH`
    D
    `(CH_(3))_(3)overset(.)C`

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