LIQUIDS AND SOLIDS MCQs
(a) low
melting points
(b) good
conductivity in solid state
(c) high
vapour pressure
(d) solubility in
polar solvents
Q.2 Amorphous solids.
Q.2 Amorphous solids.
(a) have
sharp melting points
(b) undergo
clean cleavage when cut with knife
(c) have
perfect arrangements of atoms
(d) can
presses small regions of orderly arrangements of atoms
Q.3 The force of attraction between the atoms of helium is
(a) hydrogen
bonding
(b) coordinate
covalent bond
(c) covalent
bond
(d) london
dispersion force
Q.4 Which of the following is a pseudo-solid
(a) CaF2 (b) Glass
(c) NaCl (d) All
Q.5 Diamond is a bad conductor because
(a) It has a tight structure (b) It has a high density
(c) There
is no free electron present in the crystal of diamond to conduct electricity
(d) None
of the above
Q.6 The weakest intermolecular for a
(b) electrostatic
force between ions
(c) ion–dipole
force
(d) dipole–induced
dipole force
Q.7 In liquids intermolecular forces are
(a) very weak (b) very strong
(c) reasonably strong (d) ion–dipole force
Q.8 Values of heat of vaporization for liquids, with strong
dipole–dipole forces will be
(a) very high (b) very low
(c) reasonably high (d) negligible
Q.9 Instantaneous dipole–induced dipole force is also called
(a) dipole force (b) london dispersion
(c) hydrogen bonding (d) none of the above
Q.10 Down the group polarizability generally
(a) increases (b) decreases
(c) remains constant (d) do not follow a regular trend
Q.11 Trend of boiling points of halogens from fluorine to
iodine is that it.
(a) decreases (b) increases
(c) remains constant (d) negligible
Q.12 Molecules of hydro carbons with large chain lengths
experience
(a) repulsive forces (b) strong attractive force
(c) weaker
attractive forces
(d) no
attractive force
Q.13
Hydrocarbons which generally have high molecular masses exist is.
(a) solid form (b) liquid form
(c) vapour form (d) gaseous form
Q.14 Exceptionally low acidic strength of HF is due to
(a) strong polar bond (b) small size of fluorine
(c) strong hydrogen bonding (d) Vander Waal’s forces
Q.15 Long chain of amino acids are coiled about one another
into spiral by.
(a) covalent bond (b) ionic bond
Q.16 Evaporation of water is possible at
(a) 100oC (b) 0oC
(c) at all temperatures (d) above 100oC
Q.17 Boiling point is low for liquid with
(a) high
vapour pressure at given temperature
(b) low
vapour pressure at a given temperature
(c) very
high vapour pressure
(d) very
low vapour pressure
Q.18 At equilibrium rate of evaporation and rate of
condensation
(a) become very high (b) become very low
(c) can never be equal (d) become equal
Q.19 In an open system vapour pressure of water at 100oC at
sea level is
(a) 700 mm of Hg (b) 760 mm of Hg
(c) 670 mm of Hg (d) 1000 mm of Hg
Q.20 Molar heat of vaporization of water is
(a) 140.6 kJ/mol (b) 14.06 kJ/mol
(c) 18
kJ/mol (d) 40.6 kJ/mol
Q.21 When external pressure is 23.7 torr boiling point of
water is
(a) 100oC (b) 200oC
(c) 98oC (d) 25oC
Q.22 Distillation under very reduced pressure is called
(a) fractional distillation (b) distillation
(c) vacuum
destructive distillation
(d) destructive
distillation
Q.23 Water may boil at 120oC when external pressure is
(a) 760 torr (b) 100 torr
(c) 1489 torr (d) 700 torr
Q.24 Amount of heat absorbed when
one mole of solid melts into liquid form at its melting point is called
(a) molar
heat of sublimation
(b) heat
of vaporization
(c) latent
heat of fusion
(d) molar
heat of fusion
Q.25 Ethanol is much more soluble
in water than ethyl ethanuate which one of the following statement correctly
account for this
(a) ethanol
is polar molecule but ethyl ethanoate is non–polar
(b) ethanol
is non polar molecule but ethyl ethanoate is polar
(c) a hydrogen
bond is formed between H–atom of the OH group in ethanol and O–atom of water
molecule
(d) a hydrogen bond
is formed between the H–atom of the OH group in ethanol and hydrogen of the
water molecule
Q.26 The
boiling point of a liquid will be
(b) higher
at high altitude
(c) same
at sea level and high altitudes
(d) equal
to atmospheric pressure
Q.27 The process in which liquids can be made to boil at low
temperature is called
(a) vacuum
distillation
(b) destructive
distillation
(c) distillation
(d) vacuum
destructive distillation
Q.28 Why is the boiling point of methane greater than that
of neon
(a) a
molecule of methane has a greater mass
(b) a
molecule of methane has more electrons than a molecule of neon
(c) the
molecules of methane have stronger intermolecular forces than those of neon
(d) the
molecule of methane is polar but that of neon is not
Q.29 The amount of heat required to vaporize one mole of a
liquid at its boiling point is called
(a) molar
heat of vaporization
(b) molar
heat of fusion
(c) latent
heat of fusion
(d) molar
heat of sublimation
Q.30 Which of the elements in its
crystalline form will have the lowest enthalpy change of vaporizations
(a) chlorine (b) argon
(c) phosphorous (d) silicon
Q.31 Crystals show variation in physical properties depending upon the
direction. The property is called
(a) isomorphism (b) polymorphism
(c) anisotropy (d) isotropy
Q.32 Certain melt to a turbid
liquid phase with properties of liquids as well as some degree of order like
solid. Such turbid liquids are called
(a) anorphous solid (b) vitreous solid
(c) crystalline solid (d) liquid crystal
Q.33 Isomorphous crystals show
(a) same
chemical properties
(b) same
physical properties
(c) same
crystalline form
(d) same
melting point
Q.34 Existence of an element in more than form is known as
(a) allotropy (b) isomorphism
(c) isotropy (d) none of these
Q.35 Crystalline forms of the same, substance can coexist in
equilibrium with each other at its
(a) melting point (b) transition temperature
(c) boiling point (d) none of these
Q.36 Crystal lattice of substance can be catagorised into
(a) five types (b) seven types
(c) six types (d) none of these
Q.37 Covalent solids are composed of (a) ions (b) different molecules
Q.37 Covalent solids are composed of (a) ions (b) different molecules
(c) neutral atoms (d) any of the above
Q.38 Carbon atoms of diamond are
(a) sp
hybridized (b) sp2 hybridized
(c) sp3 hybridized (d) unhybridized
Q.39 Molecular crystals are generally
(a) hard (b) soft
(c) unstable (d) stable
Q.40 Ionic crystals are
(a) hard (b) soft
(c) brittle
(d) amorphous
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