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Initial concentration of the reactant is 1.0M. The concentration becomes 0.9M, 0.8M and 0.7M in 2 hours, 4 hours and 6 hours respectively. Then the order of reaction is

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zero

answer is C.

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Detailed Solution

Time(hours)	initial concentration(M)	x
0	1
2	0.9	1-0.9=0.1
4	0.8	1-0.8=0.2
6	0.7	1-0.7=0.3

By hit and trial method

K₀ at 2 hrs = $\frac{x}{t} = \frac{0.1}{2}$

K₀ at 4 hrs = $\frac{x}{t} = \frac{0.2}{4}$

K₀ at 6 hrs = $\frac{x}{t} = \frac{0.3}{6}$

Since rare constant is same it is zero order reaction

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