Assetion and reason type questions in the lesson is matter around us pure
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D. A is false but R is true.
E. Both A and R are false.
Explanation:
1. Assertion: Oxygen is an element. Reason: It cannot be decomposed by a physical or a chemical process.
2.Assertion : When a beam of light is passed through a colloidal solution placed in a dark place the path of the beam becomes visible.
Reason : Light gets scattered by the colloidal particles.
3. Assertion : A mixture of benzoic acid and naphthalene can be separated by crystallization from water.
Reason : Benzoic acid is soluble in hot water but naphthalene is insoluble in hot water.
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