Question

The melting point of a substance decreases with increase in presence of impurities in it. The melting point of ice decreases from 0 °C to -22 °C on mixing salt in it in proper proportion. That is why salt is added to make freezing mixtures to keep ice creams frozen. I want to ask that suppose ice melts at 0 °C and we are now adding salt to lower melting point but now when we have lowered the melting point the ice will melt more quickly, then what is the purpose of mixing salt?​

Answer 1

Answer:

We know that the presence of impurities in a substance results in a lower melting point due to a process called melting point depression. Hence, if we add some impurities in ice, then the melting point of ice decreases from 0 °C to -22 °C on mixing salt in it in proper proportion.

Explanation:

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Answer 2

Answer:

Whenever light falls on the transition element compounds electrons excite and electrons absorb energy and excite. When these electrons de-excite they release visible light wavelength. That's why transition element compounds exhibit colour.