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NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions

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Question : 32
Total: 39
In a reaction, 2A → products, the concentration of A decreases from 0.5 mol L‌–1 to 0.4 mol L‌–1 in 10 minutes. Calculate the rate during this interval.
Solution:  
Average rate =−
1
2
Δ[R]
Δt
=−
1
2
[R]2−[R]1
t2−t1
=−
1
2
×
0.4−0.5
10

=−
1
2
×
−0.1 M
10

=5×10−3Mmin−1
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