Exam preparation MCQs with answers

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Color of the glow produced in the discharge tube:
  • (A)  depends on the pressure in the discharge tube
  • (B)  depends on the metal used as cathode
  • (C)  depends on the gas used in the discharge tube
  • (D)  does not depend on the nature of the gas used in the discharge tube
Covalent network crystals have_____________
  • (A)  higher melting point then molecular crystals
  • (B)  lower melting point then molecular crystals
  • (C)  discrete molecules linked by Van der waals forces
  • (D)  hydrogen bonding