Every one knows about the importance of water. Though it is abundant in nature, yet it can be produced in laboratory by the following reaction 2H2 + O2 2H2O If Hf is the heat of formation of H2O and Hr is the heat of this reaction, then

  • (A) Hf = Hr
  • (B) Hr = Hr/2
  • (C) Hr = Hr/2
  • (D) Hf = 2Hr;
Correct Answer: B

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