# The reaction $2\mathrm{NO}\left(\mathrm{g}\right)+{\mathrm{O}}_{2}\left(\mathrm{g}\right)⇌2{\mathrm{NO}}_{2}\left(\mathrm{g}\right)$ is of first order. If volume of reaction vessel is reduced to 1/3, the rate of reaction would be (a) 1/3 times              (b) 2/3 times               (c) 3 times                 (d) 6 times

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