A diatomic gas, having $C_{p}=\frac{7}{2} R$ and $C _{ v }=\frac{5}{2} R ,$ is heated at constant pressure. The ratio $dU : dQ : dW :$
  • A$5: 7: 3$
  • B$5: 7: 2$
  • C$3: 7: 2$
  • D$3: 5: 2$
JEE MAIN 2021, Diffcult
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