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WBJEE 2021 Physics and Chemistry Solved Paper

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CHEMISTRY

CATEGORY - I (Q41 to Q70)

Carry 1 mark each and only one option is correct. In case of incorrect answer or any combination of more than one answer, ¼ mark will be deducted.

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Question : 50

Total: 80

Under the same reaction conditions, initial concentration of 1.386moldm−3 of a substance becomes half in 40s and 20 s through first-order and zero-order kinetics respectively. Ratio (

) of the rate constants for first-order (k1) and zero-order (k0) of the reactions is

0.5mol−1dm3
0.5moldm−3
1.0moldm−3
2.0mol−1dm3

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