ASSERTION- Air is a mixture, not a compound. REASON - The proportions of the constituents of air vary from place to place. Even in the same place the proportion varies from time to time. In a compound, the proportions of different constituents always remain fixed.
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Both assertion and reason are true ..and assertion (a) is correct explanation of reason (r)...
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both asseration and reaskn are true and reason is correct explanation of assertion.
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