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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:
Options:
A .  - 18.69 KJ
B .  + 1.13 KJ
C .  + 18.69 KJ
D .  - 1.13 KJ
Answer: Option D
:
D
The given equations for the combustions of different types of phosphorous are:
(y) P4+5O2P4O109.91KJ(i)
(R) P4+5O2P4O108.78KJ(ii)
Now when we subtract we get (i) - (ii) gives
​(y) P4(R)P41.13KJ

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