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A diatomic ideal gas undergoes a thermodynamic change according to the $P-V$ diagram shown in the figure. The heat given the gas in $AB$
  • A$2.5\,\, P_0\,V_0$
  • B$1.4\,\, P_0\,V_0$
  • C$3.9\,\, P_0\,V_0$
  • D$1.1\,\, P_0\,V_0$
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