Which of the following is/are the example/examples of chemical change? (1) Crystallization of sodium chloride (2) Melting of ice (3) Souring of milk Select the correct answer using the code given below.
3 only
Chemical changes took place when chemical reactions among substances form new products. Crystallization of sodium chloride is incorrect as solubility of sodium chloride in water will not result in excess change in freezing and boiling points. Melting of ice is also incorrect as it is a physical change since it employs change in physical state of water from ice in solid state to water in liquid state. Souring of milk is a chemical change as it results in production of sour tasting lactic acid, so this is correct, hence option B is correct.
Important Questions from Chemical Reactions
Aspartame is an artificial sweetener sold in the market. It consists of amino acids and provides calories like other amino acids. Yet, it is used as a low-calorie sweetening agent in food items. What is the basis of this use?
Photochemical smog is a resultant of the reaction among
- Phosphorus is kept in water because
The decomposition of gaseous Ammonia on a hot platinum surface is a _______________ order reaction at high pressure.
What is the product formed when sodium bicarbonate is heated strongly?
