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
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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
A. F2
B. CI2
C. Br2
D. I2
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
A. 9.1 x 10-31 kg
B. 8 kg
C. 4 kg
D. 2 kg
A. greater mass of canal ray particles
B. greater charge of the canal ray particles
C. greater mass and charge of the canal ray particles
D. actually e/m ratio of canal rays is greater than that of the cathode rays
A. molecules are stable
B. molecules are unstable
C. nuclei are stable
D. nuclei are unstable
A. increase in the mass number of the metal used as anode
B. decrease in the mass number of the metal used as anode
C. decrease in the proton number of the metal used as anode
D. increase in the proton number of the metal used as anode