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Measurement of Volume

Which of the ...

Question

Which of the following does not have zero entropy even at absolute zero ?
CO, CO₂, NaCl, NO

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Solution

CO and NO do not have zero entropy even at absolute zero. These solids do not have perfect order even at absolute zero.
NaCl is ionic and CO₂ is a symmetrical linear molecule and this both have zero entropy at 0K.

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