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Q: Which of the following is not a chemical reaction?
  • A. Decomposition
  • B. Oxidation
  • C. Gravity
  • D. Hydrolysis
Correct Answer: Option C - Gravity is not a chemical reaction. Gravity is a physical reaction. Physical change is the change in which the colour, form, shape, and dimensions of the substance changes. No new substance is formed in it. Such as dissolving of sugar in water, breaking of glass. The change in which a new substance is obtained (which is completely different in chemical and physical properties from the original substance) is called a chemical change such as rusting of iron, curdling of milk, etc.
C. Gravity is not a chemical reaction. Gravity is a physical reaction. Physical change is the change in which the colour, form, shape, and dimensions of the substance changes. No new substance is formed in it. Such as dissolving of sugar in water, breaking of glass. The change in which a new substance is obtained (which is completely different in chemical and physical properties from the original substance) is called a chemical change such as rusting of iron, curdling of milk, etc.

Explanations:

Gravity is not a chemical reaction. Gravity is a physical reaction. Physical change is the change in which the colour, form, shape, and dimensions of the substance changes. No new substance is formed in it. Such as dissolving of sugar in water, breaking of glass. The change in which a new substance is obtained (which is completely different in chemical and physical properties from the original substance) is called a chemical change such as rusting of iron, curdling of milk, etc.