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Question

The heat of combustion of yellow phosphorous is 9.9 kJ and of red phosphorous is 8.78 kJ. The heat of transition of yellow phosphorus to red phosphorus is:

A
9.91 kJ
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B
8.78 kJ
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C
9.37 kJ
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D
1.13 kJ
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Solution

The correct option is C 1.13 kJ
P(red)+52O2P2O5;H=8.78

P(yellow)+52O2P2O5;H=9.91

Substracting
P(Red)+52O2P(Yellow)52O2P2O5P2O5

P(Red)P(Yellow)=0;

H=8.78+9.91=1.113

P(Red)P(Yellow)H=1.13

P(Yellow)P(Red)H=1.13kJ

Hence, option D is correct

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