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For a first order reaction, (A) $→$ products, the concentration of A changes from 0.1 M to 0.025 M in 40 minutes. The rate of reaction when the concentration of A is 0.01 M is:

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Let R be the real line. Consider the following subsets of the plane $R×R$.$S={(x,y):y=x+1and0<x<2},T={(x,y):x−y$is an integer }. Which one of the following is true?

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