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The enthalpies of elements in their stan...

The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound

A

is always negative

B

is always positive

C

may be positive or negative

D

is never negative

Text Solution

Verified by Experts

The correct Answer is:
C
Combustion of elements for the formation of compound can be exothermic or endothermic.
e.g., `C+ O_(2) to CO_(2)` is exothermic.
whereas, `C+ 25 to CS_(2)` is endothermic.
Hence, enthalpy of formation can be positive or negative.
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