Which of the following is not a chemical reaction'? (1) Burning of paper (2) Digestion of food (3) Conversion of water into steam (4) Burning of coal

Which of the following is not a chemical reaction'? (1) Burning of paper (2) Digestion of food (3) Conversion of water into steam (4) Burning of coal
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(3) Conversion of water into steam Explanation: The conversion of water into steam is an example of a physical change. where the state of the matter changes without changing its composition. A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
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.Identify the physical and chemical changes from the following (i)Burning of magnesium in air (ii)Electrolysis of water (iii)Tarnishing of silver spoon (iv)Sublimation of iodine -Chemistry

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