A diatomic gas undergoes a process represented by $PV ^{1.3}=$ constant. Choose the incorrect statement
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[ $R$ is the gas constant]
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$(2)$ The ratio of heat transfer during processes $1 \rightarrow 2$ and $2 \rightarrow 3$ is $\left|\frac{ Q _{1 \rightarrow 2}}{ Q _{2 \rightarrow 3}}\right|=\frac{5}{3}$
$(3)$ The above thermodynamic cycle exhibits only isochoric and adiabatic processes.
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