Problem: Which of the following processes is expected to be endothermic? a) combustion of a hydrocarbon b) freezing of liquid N2 at its normal melting point ( 53 K ) c) vaporization of zinc at its normal boiling point ( 1179 K) d) All of these are endothermic  e) None of these are endothermic

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Which of the following processes is expected to be endothermic?

a) combustion of a hydrocarbon

b) freezing of liquid N2 at its normal melting point ( 53 K )

c) vaporization of zinc at its normal boiling point ( 1179 K)

d) All of these are endothermic 

e) None of these are endothermic

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