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Question

The temperature of ice can be decreased below 0C by mixing ________ in it.

A
saw dust
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B
sand
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C
salt
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D
coal
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Solution

The correct option is C salt
The freezing point of water is 0∘C, so water-ice slush stays at 0∘C.

If it was lower, it would stabilize at the lower temperature. By adding salt, you are lowering the freezing temperature.

Therefore, the option is C.

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