The given graph is a representation of kinetics of a reaction. The...

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1. Azero order ($y =$ concentration and $x =$ time), first order ($y =$ rate constant and $x =$ concentration)
2. Bzero order ($y =$ rate and $x =$ concentration), first order ($y = t\dfrac{1}{2}$ and $x =$ concentration)
3. Czero order ($y =$ rate and $x =$ concentration), first order ($y =$ rate and $x = t\dfrac{1}{2}$
4. Dzero order ($y =$ concentration and $x =$time),
   first order ($y = t\dfrac{1}{2}$ and $x =$ concentration)