MCQ
Conc. $HNO_3$ is yellow coloured liquid due to
- Adissolution of $NO$ in conc. $HNO_3$
- ✓dissolution of $NO_2$ in conc. $HNO_3$
- Cdissolution of $N_2O$ in conc. $HNO_3$
- Ddissolution of $N_2O_3$ in conc. $HNO_3$
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(At. nos. $Cr = 24, \,Mn = 25,\, Fe = 26, \,Co = 27$)

$\frac{{dx}}{{dt}} = k\left[ P \right]{\left[ Q \right]^{0.5}}{\left[ R \right]^{0.5}}$
Which statement about the above equation is wrong?