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STD 12 - 3. Chemical kinetics — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 3. Chemical kinetics4 Marks
MCQ
For the reaction , $A + B \to 2C + D$ which one is the incorrect statement ?
  • A
    Rate of disappearance of $A =$ Rate of disappearance of $B$
  • B
    Rate of disappearance of $A =$ Rate of appearance of $D$
  • ✓
    Rate of disappearance of $B = 2 \times $ Rate of appearance of $C$
  • D
    Rate of disappearance of $B = 1/2 \times $ rate of appearance of $C$
✓

Answer

Correct option: C.
Rate of disappearance of $B = 2 \times $ Rate of appearance of $C$
c
R.O.R.$ =  - \frac{{{\text{d}}[{\text{A}}]}}{{{\text{dt}}}} =  - \frac{{{\text{d}}[{\text{B}}]}}{{{\text{dt}}}}$ $ = \frac{1}{2}\frac{{{\text{d}}[{\text{C}}]}}{{{\text{dt}}}} = \frac{{{\text{d}}[{\text{D}}]}}{{{\text{dt}}}}$

R.O.D. of  ${\text{A}} =  - \frac{{{\text{d}}[{\text{A}}]}}{{{\text{dt}}}}$

R.O.D. of  $\mathrm{B}=-\frac{\mathrm{d}[\mathrm{B}]}{\mathrm{dt}}$

R.O.A. of $C=\frac{d[C]}{d t}$

R.O.A. of $D=\frac{d[D]}{d t}$

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