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  1. The number of water molecules in gypsum and in plaster of paris are respectively
  2. At 298 K the enthalpy of formation of liquid water is -285.9 kJ/mol
  3. In a buffer solution containing equal concentration of B⁻ and HB,
  4. In graphite C atom is in …state
  5. Electric configuration of chalcogens in their outermost orbit is