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Question

The heat of combustion of yellow phosphorous & red phosphorous are - 9.91 KJ and - 8.78 KJ respectively. The heat of transition of yellow phosphorous to red phosphorous is:


A

- 18.69 KJ

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B

+ 1.13 KJ

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C

+ 18.69 KJ

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D

- 1.13 KJ

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Solution

The correct option is D

- 1.13 KJ


The given equations for the combustions of different types of phosphorous are:
(y) P4 + 5O2P4O10 9.91KJ (i)
(R) P4 + 5O2P4O10 8.78KJ (ii)
Now when we subtract we get (i) - (ii) gives

​(y) P4(R)P4 1.13KJ

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