Chemical Kinetics

JEE Main 2024 (Online) 29th January Evening ShiftNumericalMedium📈 Topic in 37% papers+4

Ques. 1JEE Main 2024, 29 January (Evening Shift)

The half-life of radioisotope bromine - 82 is 36 hours. The fraction which remains after one day is 10-2. (Given antilog 0.2006 = 1.587)

Answer

Radioactive decay is first order: k = 0.693t1/2 = 0.69336 h-1

N0N = kt2.303 = 0.693 2436 2.303 = 0.2006 (t = 1 day = 24 h)

⇒ N0N = antilog 0.2006 = 1.587

∴ NN0 = 11.587 = 0.63 = 63 × 10-2

Answer: 63

Ques. 2JEE Main 2024, 27 January (Morning Shift)

Consider the following data for the given reaction 2HI(g) H2(g) + I2(g) [figure] The order of the reaction is .

Ques. 3JEE Main 2024, 27 January (Evening Shift)

Time required for completion of 99.9% of a First order reaction is times of half life (t1/2) of the reaction.

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