$A$ first order reaction with respect to the reactant $A$ has a rate constant of $6 \; sec^{-1}$. If we start with $[A] = 0.5 \; mol/L$,then in what time the concentration of $A$ becomes $0.05 \; mol/L$ ........... $sec$
- A$0.38$
- B$0.214$
- C$0.384$
- D$0.402$
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$A$ first order reaction requires $30 \ min$ for $50\%$ completion. The time required to complete the reaction by $75\%$ will be .......... $\min.$
Medium
View SolutionWhich one of the following plots is correct for a first order reaction?
The rate constant of a first order reaction is $1.15 \times 10^{-3} \ s^{-1}$. How long will $5 \ g$ of reactant take to reduce to $3 \ g$ (in $s$)?
For a first order reaction $A \rightarrow B$, the data is provided in the table below. Find $x$ in minutes. (Nearest integer)
$t/\text{min}$ $[A]/M$ $0$ $0.6500$ $x$ $0.0650$ $20$ $0.00065$
| $t/\text{min}$ | $[A]/M$ |
|---|---|
| $0$ | $0.6500$ |
| $x$ | $0.0650$ |
| $20$ | $0.00065$ |
DifficultJEE MAIN 2026
View SolutionWhat is the time required for $99 \%$ completion of a first order reaction if the rate constant is $23.03 \ min^{-1}$?
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