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Problem 6 - Entrance Test

The rate law for 2NO + O₂ → 2NO₂ is rate = k[NO]²[O₂]. If [NO] doubles and [O₂] halves, the rate

Correct: A

Rate depends on [NO]²×[O₂]. Doubling [NO] increases rate by 4×, halving [O₂] halves rate. Net factor: 4×0.5 = 2. Rate doubles.