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The correct order of thermal stability o...

The correct order of thermal stability of hydrides of group `15` is

A

`NH_(3)ltPH_(3)ltAsH_(3)ltSbH_(3)ltBiH_(3)`

B

`NH_(3)gtPH_(3)gtAsH_(3)gtSbH_(3)gtBiH_(3)`

C

`PH_(3)gtNH_(3)gtAsH_(3)gtSbH_(3) lt BiH_(3)`

D

`AsH_(3)ltPH_(3)gtSbH_(3)gtBiH_(3)gtNH_(3)`

Text Solution

Verified by Experts

The correct Answer is:
B
Down the group the `X-H` bond length increses with increase in size of atom. So bond dissociation energies decrease and therefore, thermal stability decreases. Hence the correct decreasing order is `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3) gt BiH_(3)`
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Knowledge Check

  • The correct order of thermal stability is

    A
    `HOCl lt HClO_(3) lt HClO_(2) lt HClO_(4)`
    B
    `HOCl gt HClO_(2) gt HClO_(3) gt HClO_(4)`
    C
    `HClO lt HClO_(2) lt HClO_(3) lt HClO_(4)`
    D
    `HClO_(4) lt HClO lt HClO_(2) lt HClO_(3)`

  • The correct order of thermal stability of hydroxide is

    A
    `Mg (OH ) _(2) lt Sr (OH ) _(2) lt Ca ( OH ) _(2) lt Ba ( OH) _(2)`
    B
    `Mg ( OH ) _(2) lt Ca (OH ) _(2) lt Sr (OH) _(2) lt Ba (OH) _(2)`
    C
    `B a (OH) _(2) lt Sr (OH) _(2) lt Ca (OH) _(2) lt Mg ( OH) _(2)`
    D
    `Ba ( OH) _(2) lt Ca( OH ) _(2) lt Sr ( OH) _(2) lt Mg ( OH) _(2)`

  • The correct order of thermal stability of hydroxides is :

    A
    `Ba(OH)_(2) lt Ca(OH)_(2)lt Sr(OH)_(2) lt Mg(OH)_(2)`
    B
    `Mg(OH)_(2) lt Sr(OH)_(2) ltCa(OH)_(2) ltBa(OH)_(2)`
    C
    `Mg(OH)_(2) lt Ca(OH)_(2)lt Sr(OH)_(2) lt Ba(OH)_(2)`
    D
    `Ba(OH_(2) lt Sr(OH)_(2) lt Ca(OH)_(2) lt Mg(OH)_(2)`

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