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answer is A.
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Detailed Solution
H2Ol⇌H2Os;ΔH=−Ve; Freezing is exothermic;For this process ΔS=−Ve; Freezing leads to decrease in randomness;ΔG=ΔH−TΔSΔG=−Ve−T−VeFreezing point of water is 273 K∴At 273 K; ΔG=0When T>273 K,ΔG=+VeWhen T<273 K, ΔG=−Ve