Keeping in mind different factors which affect the boiling point of a substance, element having highest boiling among the following is
A. He
B. F2
C. Ne
D. Br2
Correct Answer: D. Br2
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The increasing vapor pressure caused by heating a liquid is due to
A. increase intermolecular interactions
B. increasing potential energy of molecules
C. increasing kinetic energy of molecules
D. decreasing surface tension
Correct Answer: C. increasing kinetic energy of molecules
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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
Correct Answer: A. higher melting point then molecular crystals
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Keeping in mind different factors which affect the boiling point of a liquid, element having lowest boiling point among the following is
A. F2
B. CI2
C. Br2
D. I2
Correct Answer: A. F2
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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
Correct Answer: C. depends on the gas used in the discharge tube
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Dr. Khan told his students that if charge on electrons in a chamber is 3.50 x 10 11 coulomb than mass of electrons must be
A. 9.1 x 10-31 kg
B. 8 kg
C. 4 kg
D. 2 kg
Correct Answer: D. 2 kg
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e/m ratio of the canal rays is less than that of cathode rays. The reason is
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
Correct Answer: A. greater mass of canal ray particles
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