1.

wheninitialconcentrationof a reactant isdubledin areactionitshalf -lifeperiod isnotaffected , theorderif thereaction is

Answer»

zero
first
second
morethanzerobutlessthanfirst

Solution :for a zero orderreaction `t_(1//2)` is directlyproportionalto theintial CONCENTRATION of THEREACTANT `|R|_(0)`
`t_(1//2)prop|R|_(0) `
for a firstorderreaction
`k=(2303)/(t) LOG ""(|R|_(0))/(|R|)`
` at t_(1//2)|R|=(|R|_(0))/(2)`
so the aboveequation becomes
`K=(2303)/(t_(1//2))log""(|R|_(0))/([R]_(0)//2)`
`t_(1//2)=(2303)/(K)= log ""2= (2303)/(K)xx.3010`
`t_(1//2) = (.693)/(K)`
i.e., half lifeperiodis independent of initial concentration of areactant .


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