The correct is

1.	The correct is
Answer» `{:(A,B,C,D),(3,4,2,1):}` `{:(A,B,C,D),(2,3,1,4):}` `{:(A,B,C,D),(1,3,4,2):}` `{:(A,B,C,D),(1,3,4,2):}` Solution :`DELTA H= H_(P) - H_(R ) " if " H_(P) gt H_(R ) rArr Delta H gt 0` `P Delta V= 0` at constant volume `E + PV = H=` total heat constant `H_(R ) gt H_(P) rArr Delta H lt 0 rArr` exothermic

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