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A liquid of density 1.742 g is observed to show a capillary rise of 73 mm in a tube of radius 0.65 mm. Then the surface tension of the liquid is
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The average kinetic energy of the molecule of (moL wt. = 64) at 27°C is E. Then the average kinetic energy of at 27°C is
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The number of atoms per unit cell in bcc arrangement is
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Match box has the symmetry of which of the following systems?
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The vapour density of completely dissociated sociated would be
A. Determined by the amount of solid used in the experiment
B. Triple to that of
D. Slightly less than half of that of
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Of the following properties, the magnitude of one must always increase with temperature. The property is
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The vapour density of gas A is four times that of gas B. If the molecular weight of gas B is M, then the molecular weight of gas A is
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The relation between molecular wt. and vapour density is
A. Molecular wt. = V.D.
B. Molecular wt. = V.D.
D. Molecualr wt = 2 x V.D.
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Which of the following would you expect to affect the vapour pressure of a liquid?
A. Inter-molecular forces in the liquid
B. Volume of the liquid in the liquid-vapour equilibrium
C. Volume of the vapour in the liquid-vapour equilibrium
D. The size of the container in which liquid-vapour equilibrium is establishe
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To which of the following mixtures is the Dalton's law of partial pressures not applicable?
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Kinetic theory of gases postulates :
A. The molecules in a gas are in stationary state
B. The molecules in a gas exert appreciable attraction on each other
C. The molecules move in a random motion with widely different velocities
D. The molecules in a gas collide against each other as well as the wall of the container, but do not change their direction of motion
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A balloon filled with ethane is pricked up with sharp point and quickly plunged into a tank of hydrogen at the same pressure. After some time balloon will
C. remain unchanged in size
D. have half its volume of the gas
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6.If the reactants and products both are in gaseous phase they bear a simple ratio in their
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In which one of the following does diffusion occur most rapidly?
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The V.D. of a gas is 11.2 gm. The volume occupied by 11.2 gm. of this gas at N.T.P. is
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If the temperature and pressure remain unchanged the volume of obtained by the decomposition of a certain volume of will be
A. Triple the volume of
B. Half the volume of
C. Equal to the volume of
D. One third the volume of
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The ionic radii of and are 0.66 and 1.40 , respectively. The most probable type of gteometry exhibited by MgO on the basis of radius ratio rule is
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5.At a given temperature and pressure 2 volumes of A combine with 5 volumes of B to form 2 volmes of C and 1 volume. A combine with one volume of B to form 2 volumes of D. The formula of C is
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If the tetrahedral sites in ccp arrangement of negative ions (Y) were half filled with cation (X), the empirical formula of the compound would be
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7.Which of the following sets of conditions represent the easiest way to liquefy a gas?
A. Low temperature and high pressure
B. High temperature and low pressure
C. High temperature and low pressure
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4
In zinc blende structure, the zinc atoms occupy
C. half of the octahedral sites
D. half of the tetrahedral sites
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The ionic radii of and ions are 1.47 and 1.95 , respectively. The most probable type of geometry exhibited by RbBr on the radius ratio rule is
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The vol. of 20 gm. of hydrogen at N.T.P. is
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In the process of sublimation, the substance transforms directly
A. from the solid state to the liquid state
B. from the liquid state to gaseous state
C. from the solid state to gaseous state
D. from the liquid state to solid state
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The vapour density of ozone would be
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In a dose packed arrangement of N spheres, the number of tetrahedral holes are
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1.The correct relationship representing the volume occupied by 44 gm of and 64 gm of at constant temperahire and pressure:
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Volume occupied by 4.4 gift of carbon dioxide is
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The critical temperature of a substance is defined as
A. the temperature above which the substance decomposes
B. the temperature above which the substance can exist only as a gas
C. melting point of the substance
D. boiling point of the substanc
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In a closed packed structure the pattern ABAB...... represents which one of the following: