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3. Chemical kinetics — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry3. Chemical kinetics1 Mark
MCQ
Which equation is correct for first order reactions
  • A
    ${t_{1/2}} \propto {C^{ - 1}}$
  • B
    ${t_{1/2}} \propto C$
  • ✓
    ${t_{1/2}} \propto {C^0}$
  • D
    ${t_{1/2}} \propto {C^{1/2}}$
✓

Answer

Correct option: C.
${t_{1/2}} \propto {C^0}$
c
(c)The relation between half -life period and initial concentration $(c)$ for a $n^{th }$ order reaction is given by ${t_{1/2}} \propto \frac{1}{{{C^{n - 1}}}}$ for first order reaction $(n = 1)$. ${t_{1/2}} \propto \frac{1}{{{C^{1 - 1}}}}$ or ${t_{1/2}} \propto {C^0}$.

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