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Q.

The specific heat I2 in vapour and solid state are 0.031 and 0.055 cal/g respectively. The heat of sublimation of iodine at 2000C is 6.096kcal mol-1 The heat of sublimation of iodine at   250∘C will be

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a

3.8kcal mol-1

b

4.8kcal mol-1

c

5.8kcal mol-1

d

2.28kcal mol-1

answer is D.

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Detailed Solution

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∆H-∆H1T2-T1=ACP ∴∆H250-6.096250-200=0.31-0.055254×10-3 ∴∆H250=5.791

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