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3. Chemical kinetics — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry3. Chemical kinetics1 Mark
MCQ
The half-life for a zero order reaction having $0.02 \;M$ initial concentration of reactant is $100 \;s$. The rate constant (in $mol \left.L^{-1} s^{-1}\right)$ for the reaction is
  • A
    $1.0 \times 10^{-2}$
  • ✓
    $1.0 \times 10^{-4}$
  • C
    $2.0 \times 10^{-4}$
  • D
    $2.0 \times 10^{-3}$
✓

Answer

Correct option: B.
$1.0 \times 10^{-4}$
b
For zero order reaction

$t _{1 / 2}=\frac{ a }{2 k } \Rightarrow k =\frac{ a }{2 t _{1 / 2}}$

$k =\frac{0.02}{2 \times 100}=1.0 \times 10^{-4} mol L ^{-1} s ^{-1}$

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