Question

which of the following is not a chemical reaction? 1. formation of salts solution 2. milk turns sour in hot weather 3. burning of match stick 4. contamination of food​

Answer 1

Contamination of food is not a chemical reaction.

Option 4. Contamination of food is correct.

Explanation:

• 1. Formation of salt's solution: to form a salt's solution, a chemical reaction must happen between the salt and water.

• 2. Milk turns sour in hot weather: it happens because of the formation of lactic acids, which is operated by highly increasing of bacterias in hot weather.

• 3. Burning a match stick: matches burn with the help of Oxygen present in the air.

• 4. Contamination of food: the contamination of food happens due to the presence of harmful chemicals or organisms like bacteria, parasites in food.

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