States of Matter NDA Questions

NDA Chemistry

States of Matter MCQ Questions


1.
Intermolecular forces are the forces of attraction and repulsion between interacting particles (atoms and molecules). They are also called:
A.
Ionic bonds — electrostatic attraction between oppositely charged ions
B.
Van der Waals forces — a collective term for all intermolecular attractive forces except hydrogen bonding
C.
Metallic bonds — electron-sea bonds in metals
D.
Covalent bonds — shared-electron bonds within molecules
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ANSWER :
B. Van der Waals forces — a collective term for all intermolecular attractive forces except hydrogen bonding
2.
DISPERSION FORCES (London forces) are:
A.
Temporary (instantaneous) attractive forces between temporarily polarised molecules caused by the momentary unequal distribution of electrons — present in ALL atoms and molecules including non-polar ones
B.
Permanent attractions between two permanent dipoles
C.
Forces between a permanent dipole and an adjacent non-polar molecule
D.
Forces due to hydrogen bonding between H and electronegative atoms
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ANSWER :
A. Temporary (instantaneous) attractive forces between temporarily polarised molecules caused by the momentary unequal distribution of electrons — present in ALL atoms and molecules including non-polar ones
3.
DIPOLE-DIPOLE FORCES occur between:
A.
Non-polar molecules with high molecular mass
B.
Molecules with very high ionisation energies only
C.
Polar molecules (permanent dipoles) — molecules with a net dipole moment attract each other through electrostatic interactions between their positive and negative ends
D.
All molecules regardless of polarity
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ANSWER :
C. Polar molecules (permanent dipoles) — molecules with a net dipole moment attract each other through electrostatic interactions between their positive and negative ends
4.
DIPOLE-INDUCED DIPOLE FORCES occur between:
A.
A molecule with a permanent dipole moment and an adjacent non-polar (or weakly polar) molecule — the permanent dipole induces a temporary dipole in the non-polar molecule
B.
Two polar molecules of similar dipole moments
C.
A cation and an anion in ionic compounds
D.
Two non-polar molecules of similar size
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ANSWER :
A. A molecule with a permanent dipole moment and an adjacent non-polar (or weakly polar) molecule — the permanent dipole induces a temporary dipole in the non-polar molecule
5.
The HYDROGEN BOND is defined as the attractive interaction between:
A.
Hydrogen atoms and metallic atoms in hydrides of metals
B.
Any two hydrogen atoms in any molecule
C.
A hydrogen atom covalently bonded to a highly electronegative atom (F, O, or N) and a lone pair of electrons on another electronegative atom (F, O, or N) in the same or different molecule
D.
Hydrogen and carbon atoms in organic molecules
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ANSWER :
C. A hydrogen atom covalently bonded to a highly electronegative atom (F, O, or N) and a lone pair of electrons on another electronegative atom (F, O, or N) in the same or different molecule
6.
Arrange the following types of intermolecular forces in INCREASING ORDER of strength:
A.
Dipole-dipole < London < Hydrogen bonding < Dipole-induced dipole
B.
London forces < Dipole-induced dipole forces < Dipole-dipole forces < Hydrogen bonding
C.
All four types have the same strength and are interchangeable
D.
Hydrogen bonding < Dipole-dipole < London < Dipole-induced dipole
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ANSWER :
B. London forces < Dipole-induced dipole forces < Dipole-dipole forces < Hydrogen bonding