When a substance changes its state from solid to liquid:

The temperature remains constant

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There is a constant rise in temperature

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There is a constant drop in temperature

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The temperature fluctuates

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Solution

The correct option is A The temperature remains constant
During change of state (from solid to liquid, gas to liquid, etc.) the heat energy that is supplied to the substance is used for the change of state and not to increase the kinetic energy of the molecules (that contributes to the temperature of the substance), so the temperature remains constant.

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