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Question

Which of the following substances do not have standard enthalpy of formation as zero?

A
Ca(s)
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B
Hg(l)
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C
O2(g)
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D
CO2(g)
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Solution

The correct option is D CO2(g)
Standard enthalpy of formation of elements in pure state at 298 K and 1 bar is zero.
Ca(s),Hg(l),O2(g) are in their standard states so standard enthalpy of formation is zero

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