Which of the following is/are chemical change?

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Burning of a wax candle

Souring of Milk

Cooking of Food

All of these

answer is D.

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Detailed Solution

Burning of wax candles, souring of milk and cooking food are chemical changes.
A chemical change has occurred when one substance is converted or transformed into one or more products. For example, in the burning of a wax candle, the hot flame vaporises the liquid wax and breaks down hydrocarbons into molecules of hydrogen and carbon. The souring of milk is a chemical change because it produces lactic acid. Cooking food requires preparing and combining ingredients and applying heat.

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