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For a reaction AtoB+C. It was found that...

For a reaction `AtoB+C`. It was found that at the end of 10 minutes from the start.The total optical rotation of the system was `50^(@)` and when the reaction is complete it qws `100^(@)`. Assume that only B and C are optically active and dextro rotatory, the rate constant of this first order reaction wouldbe

A

`6.9"min"^(-1)`

B

`0.069"min"^(-1)`

C

`0.69"min"^(-1)`

D

`6.9xx10^(-2)"min"^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`[C_(0)-x[x" "x`
`0" "C_(0)" "C_(0)`
`C_(0)alpha50,xoo25.K=2.303/10xxlog(50/25)=(2.30xx0.3010)/10=0.693/10=0.0693"min"^(-1)`
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