NDA Government Jobs Exams

Which one among the following is not a chemical change ?
(a) Curdling of milk (b) Ripening of fruit
(c) Evaporation of water (d) Burning of coal

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NDA Other Question

The acid contained in vinegar is -
(a) acetic acid (b) ascorbic acid (c) citric acid (d) tartaric acid
The acid in gastric juice is -
(a) acetic acid (b) nitric acid (c) hydrochloric acid (d) sulhpuric acid