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Which of the following statements is incorrect?

A. dispersion force is the weakest type of intermolecular interactions
B. the strong intermolecular attractions in H2O result from hydrogen bonding
C. boiling point of H2S is less than H2O
D. boiling point of non-polar substances tends to decrease with increasing molecular weight

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Correct Answer: D. boiling point of non-polar substances tends to decrease with increasing molecular weight
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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

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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

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Correct Answer: A. higher melting point then molecular crystals
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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

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Correct Answer: C. depends on the gas used in the discharge tube
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