Pick out the wrong statement pertaining to space velocity of flow reactors?

Question

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The unit of space velocity is (time)-1

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The space velocity of 3 hr-1 means that three reactor volumes of feed at specified conditions

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are being fed into the reactor every hour

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The space velocity of 3 hr-1 means that one third reactor volume of feed at specified

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conditions are being fed into the reactor

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None of these

Question #85129