In the presence of acid, the initial concentration of cane-sugar was reduced from 0.2 M to 0.1 in 5 hr and to 0.05 M in 10 hr. The order of reaction is
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Solution
0.2M→t1/2=5hr0.1M→t1/2=5hr0.05M From0.2M→t=10hr0.05M So t1/2 is constant which is characteristic of first order reaction. Hence, t1/2∝(a)0.