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The heat of atomisation of PH(3(g)) is 2...

The heat of atomisation of `PH_(3(g))` is 228 kCal `mol^(-1)` and that of `P_(2)H_(2(g))` is 355 kCal `mol^(-1)`. The energy of the P-P bond is (kn kCal)

A

102

B

51

C

26

D

204

Text Solution

Verified by Experts

The correct Answer is:
B
`PH_(3) rarr P + 3H, Delta H = 228`
`3(P- H) = 288 rArr (P - H) = 76`
`P_(2) H_(4) rarr 2P + 4H, Delta H = 355`
`(P-P) + 4(P-H) = 355`
`(P-P) = 355 -4 xx 76 = 51`
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