For $2NO(g) + Cl_2(g) \rightleftharpoons 2NOCl(g)$ , raising $[NO]$ from 0.10 to $0.20\ mol\,dm^{-3}$ at constant $[Cl_2]$ raised the initial rate from 0.0001 to $0.0004\ mol\,dm^{-3}\,s^{-1}$ . The order with respect to NO is

Explanation

Doubling the concentration multiplied the rate by four, and

2^2 = 4

Derived from ZIMSEC Chemistry Paper 2, November 2009, Q1

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