NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions
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Question : 19
Total: 39
A first order reaction takes 40 min for 30% decomposition. Calculate t 1 ∕ 2
Solution:
30% decomposition means that x = 30% of [ R 0 ]
or,[ R ] = [ R 0 ] − 0.3 [ R 0 ]
= 0.7 [ R 0 ]
For reaction of1 s t k =
log
=
log
=
log
min − 1
=
× 0.1549 min − 1
= 8.918 × 10 − 3 min − 1
For a1 s t t 1 ∕ 2 =
=
= 77.7 m i n
or,
For reaction of
For a
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