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`t_(1//4)` वह समय माना जा सकता है जिसमे किसी अभिकारक की सान्द्रता`3//4` रह जाती है प्रथम कोटि अभिकारक के लिए वेग स्थिरांक K है तब `t_(1//4)` को इस प्रकार लिखा जा सकता है
A. `0.10//K`
B. `0.29//K`
C. `0.69//K`
D. `0.75//K`

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`K=(2.303)/tlog""a/(a-x)=(2.303)/(t_(1//4))log""a/(3a//4)=(2.303)/(t_(1//4))log""4/3`
`K=(2.303xx0.125)/(t_(1//4))=(0.29)/(t_(1//4))`

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