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Heat of combustion of S (Rhombic) and S (monoclinic) are -297.5 KJ and -300 KJ mole-1 respectively. So the heat of transformation of SR to SM is

A. 2.5 KJ mole-1

B. +1.5 KJ mole-1

C. +297.5

D. 3.5 KJ mole-1

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