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. A 1-kg block of ice at 0ºC is placed into a perfectly insulated, seated container that has 2 kg of water of also at 0ºC. The water and ice completely fill the container, but thecontainer is flexible. After some time one can expect that (A) the water will freeze so that the mass of the ice willincrease. (B)the ice will melt so that the mass of the ice will decrease. (C) both the amount of water and the amount of icewillremainconstant. (D) both the amount of water and the amount of ice will decrease.

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A 1-kg block of ice at 0ºC is placed into a perfectly insulated, seated container that has 2 kg of water of also at 0ºC. The water and ice completely fill the container, but thecontainer is flexible. After some time one can expect that                                                                           (A) the water will freeze so that the mass of the ice  willincrease.                                               (B)the ice will melt so that the mass of the ice will decrease.                                                                             (C) both the amount of water and the amount of icewillremainconstant.                                                (D) both the amount of water and the amount of ice will decrease.

Grade:11

1 Answers

Aditi Chauhan
askIITians Faculty 396 Points
9 years ago
The correct option is (B) the ice will melt so that the mass of the ice will decrease.
In accordance to second law of thermodynamics, if an irreversible process occurs in a closed system, the entropy of that system always increases; it never decreases. Entropy measures the state of disorder. As the ice is more order than water, therefore the ice will melt so that the mass of the ice will decrease. From the above observation we conclude that, option (B) is correct.

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