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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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RESONANCE-P BLOCK ELEMENTS-Exercise 1 part 2 objective que
  1. The correct order of thermal stability of hydrides of group 15 is

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  2. The hydribes of group 15 elements act as :

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  3. The basic strength of the hydrides of group 15 elements :

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  4. Which of the following acids is monobasic?

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  5. Red and white phosphorus will differ but not in:

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  6. Compound used in safety matches is :

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  7. The high reactivity and low volatility of white phosphorous is due to:

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  8. Which of the following oxides is amphoteric in nature?

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  9. Which of the following is least reactive?

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  10. ….is obtained when ammonium dichromate is heated.

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  11. In the ostwald's process, nitric acid is prepared by the catalytic oxi...

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  12. NH(4)Cl(s) is heated in test tube.Vapours are brought in contract with...

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  13. Which of the following combines with Fe^(2+) ions to form brown comple...

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  14. NO(2) can be prepared by heating :

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  15. The wrong statement about N(2)O is :

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  16. Following are neutral oxides except :

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  17. HNO(3)+P(4)O(10) to HPO(3) + X in the above reaction the product X i...

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  18. Cold solution of barium nitrite on mixing with sulphuric acid produces...

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  19. Nitric acid usually turns yellow on standing.This is due to

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  20. Concentrated nitric acid oxidises phosphours (P) into:

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