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The enthalpy of elements in their standa...

The enthalpy of elements in their standard atates 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
Combination of elements to form a compound can be exothermic or endothermic`( e.g., C + O_(2) rarrCO_(2)` is exothermic whereas `C + 2S rarrCS_(2)` is endothermic ). Hence, enthalpy of formation can be `+ve` or `-ve`.
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