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+5O2⟶P4O10−9.91KJ−−−−−−(i) (R) P4+5O2⟶P4O10−8.78KJ−−−−−−(ii) Now when we subtract we get (i) - (ii) gives (y) P4⟶(R)P4−1.13KJ
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