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Question

# In a 1st order reaction A → products, the concentration of the reactant decreases to 6.25% of its initial value in 80 minutes. What is (i) the rate constant and (ii) the rate of reaction, 100 minutes after the start, if the initial concentration is 0.2 mole/litre?

A
2.17×102min1,3.47×104mol.litre1min1
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B
3.465×102min1,2.166×104mol.litre1min1
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C
3.465×103min1,2.17×103mol.litre1min1
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D
2.166×103min1,2.667×104mol.litre1min1
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Solution

## The correct option is B 3.465×10−2min−1,2.166×10−4mol.litre−1min−1T1/2=804=20 minK=0.69320=3.465×10−2[A]100=0.225=0.232=0.00625R100=3.465×10−2×0.00625=2.166×10−4

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