Q.

The enthalpy of combustion of a substance

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a

is always positive

b

can be either zero or greater than zero

c

is always negative

d

is unpredictable till calculations are done

answer is B.

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Detailed Solution

When one mole of compound is burnt in large excess of oxygen heat released is known as enthalpy of combustion.During combustion exothermic compounds are formed thus enthalpy is always negative

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