Intermolecular Forces and Melting Point MCQs
A microscopic property is _______
(A). Â Reactivity
(B). Â Kinetic energy
(C). Â Boiling point
(D). Â Inter-molecular force
(E). None of these
Not a necessary condition for the formation of intra-molecular hydrogen bonding is ___________
(A). Â There must be always the maximum strain during the ring closure
(B). Â The ring should be planar
(C). Â There must be always the minimum strain during the ring closure
(D). Â Â A 5 or 6-membered ring must be formed
(E). None of these
Multiple Choice Question Answer: Â a
Why the O-nitrophenol is more volatile than p-nitrophenol?
(A). Â Because of the Intra-molecular hydrogen bonding in O-nitrophenol
(B). Â Because of the Electromeric effect
(C). Â Because of Inter-molecular hydrogen bonding in O-nitrophenol
(D). Â Because of the Inductive effect
(E). None of these
Multiple Choice Question Answer: Â a
The melting point of mercury is _______
(A). Â 3570C
(B). Â 00C
(C). -390C
(D). Â 1000C
(E). None of these
Multiple Choice Question Answer: Â c
Which of the following is the correct statement?
(A). Â None of these
(B). Â When we transform a solid into a liquid it is called freezing and its reverse process is called melting
(C). Â When we transform a liquid into solid it is called melting and its reverse process is called the freezing
(D). Â When we transform a solid into a liquid it is called melting and its reverse process is called freezing
(E). None of these
Multiple Choice Question Answer:Â d
Which of the following confirms The purity of the compound?
(A). Â Its melting point and boiling point
(B). Â Chromatographic technique
(C). Â All of these
(D). Â Spectroscopy
(E). None of these
Multiple Choice Question Answer: Â c
The temperature always remains constant during a phase change due to the increased kinetic energy is used to overcome the cohesive forces in a liquid.
(A). Â False
(B). Â True
(E). None of these
Multiple Choice Question Answer:Â b
The molar heat of fusion (kJ/mol) of water is _______
(A). Â 6.01
(B). Â 0.84
(C). Â 7.61
(D). Â 1.3
(E). None of these
Multiple Choice Question Answer: Â a
The consequence of hydrogen bonding is _______
(A). Â Abnormal boiling point
(B). Â All of these
(C). Â Azeotropic behavior
(D). Â Solubility and Viscosity
(E). None of these
Multiple Choice Question Answer: Â b
The Hydrogen bonding is always maximum in which of the following?
(A). Â Diethyl ether
(B). Â Ethanol
(C). Ethyl chloride
(D). Â Triethylamine
(E). None of these
Multiple Choice Question Answer:Â b
When the solid and liquid phase are in equilibrium, what happens to the temperature?
(A). Remains constant
(B). Â Decreases gradually
(C). Â Â Increases gradually
(D). Â None of these
(E). None of these
Multiple Choice Question Answer: Â a
_________ has always the highest bond dissociation energy
(A). Â Dipole-dipole
(B). Â Vander Waals forces
(C). Â Covalent bond
(D). Â Hydrogen bond
(E). None of these
Multiple Choice Question Answer: Â c
The strength of Vander Waals forces depends upon which of the following?
(A). All of these
(B). Â Molecular structure
(C). Â Number of electrons present in the molecule
(D). Â Size of the molecule
(E). None of these
Multiple Choice Question Answer: Â a
The Molar heat of fusion is defined as the Energy required to melt _________
(A). Â one gram of solid
(B). Â ten moles of solid
(C). Â one kilogram of solid
(D). Â one mole of solid
(E). None of these
Multiple Choice Question Answer: Â d
Which of the following is The melting point of ice?
(A). Â 40C
(B). Â 1000C
(C). Â 00C
(D). Â -40C
(E). None of these
Multiple Choice Question Answer:Â c
Which of the following is the incorrect statement?
(A). Â Each pure solid crystalline substance has always a characteristic and has its unique melting point
(B). Â Two different pure substances always have their same melting points
(C). Â The Impure sample of the substance always has a different melting point
(D). Â The Melting point is always serving as the criteria of the purity of a solid substance
(E). None of these
Multiple Choice Question Answer: Â b
What is the temperature at which solid and liquid coexist in equilibrium called?
(A). Â Freezing point of liquid
(B). Â Melting point of liquid
(C). Â Freezing point of solid
(D). Â All of these
(E). None of these
Multiple Choice Question Answer:Â a
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