Why is solid $C a C l_{2}$ spread on roads in cold countries, during the winter season?

To increase the melting point of ice

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To decrease the melting point of ice

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To sublime the ice

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To reduce the temperature of ice

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Solution

The correct option is C To decrease the melting point of ice
$C a C l_{2}$ is a ionic solid which when combine with ice takes energy from it so that it can combine with solid ice. Due to decrease in kinetic energy of the ice, it starts melting at the temperature below its melting point. Hence, $C a C l_{2}$ is spread over road in cold countries, during winter season so that ice melts fastly and roads remain clear for driving.

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