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  1. At 27⁰C average kinetic energy of one mole of helium gas can be given
  2. The physical adsorption of gases on the solid surface is due to
  3. Heat of combustion ΔH for C(s) , H₂(g)and CH₄(g) are -94, -68 and -213 kcal/mol.
  4. The forces present in the crystals of naphthalene are
  5. In NH₃ and PH₃, the common feature is