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Predict the entropy change (positive/neg...

Predict the entropy change (positive/negative) in the following:
i) A liquid substance crystallizes into a solid.
ii) Temperature of a crystal is increased.
iii) 'CaCO_3(s) rarr CaO(s) rarr O_2(g)'
iv) 'N_2(g)(1 atm) rarr N_2(g)(0.5 atm)'

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i) Entropy decreases, .Delta S=-ve.
ii) Entropy increases: .Delta S=+. ve
iii) Entropy increases: .Delta S=+v e.
iv) Entropy increases, .Delta S=+ve.
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