$\mathrm{N}$ moles of a polyatomic gas $(f=6)$ must be mixed with two moles of a monoatomic gas so that the mixture behaves as a diatomic gas. The value of $\mathrm{N}$ is:
  • A$6$
  • B$3$
  • C$4$
  • D$2$
JEE MAIN 2024, Diffcult
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