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A vessel containing 10 litre of air at atmospheric pressure is connected to an evacuated 9 litre vessel The resulting pressure will be
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The coordination number of each sphere in hcp arrangement is
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Lattice energy of a solid is high if
A. the radii of the ions are large
B. radii of the ions are small
C. charge on the ions are small
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4
The number of atoms per unit cell in simple cubic, face centred cubic and body centred cubic arrangement are, respectively
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If all the octahedral sites in a cubic close packed arrangement () are completelyfilled with cations, the empirical formula of the compound could then be
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4
The mean free path of a gas molecule is the distance
A. between the two opposite walls of the container
B. through which the molecules travel in one second
C. through which molecules move between two consecutive collisions
D. travelled by all the molecules divided by the total number of molecules in a particular gas
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An open vessel at 37°C is heated until 3/5 of the air in it has been expelled. Assuming that the volume of the vessel remains constant the temperature to which the vessel is heated is
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In fluorite structure coordination number of calcium ions is
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In a dose packed arrangement of N spheres, the number of tetrahedral holes are
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The vapour density of ozone would be
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A gas or vapour may be liquefied only at a temperature at or
A. below the critical temperature
B. above the critical temperature
C. above the normal boiling point
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An element has atomic weight 24 and equivalent weight 11.9. Its valency is
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Which compound possesses greatest lattice energy?
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One mole of gas is defined as
A. The number of molecules in 22.4 litres of gas at S.T.P
B. The number of molecules contained | in 6 grams of 12 C isotope
C. The number of molecules in one formula weight of gas
D. The number of molecules in litre of gas
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The electrical conductivity of metals is of the order of
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A closed vessel contains equal number of molecules of a total pressure at 740 mm. If oxygen is removed from the system the pressure will
D. become double of 740 mm
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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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What will be the mass of 6.03 x molecules of carbon monoxide ?
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In a close packed arrangement of N spheres, the number of octahedral holes are
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Molecular formula of D in the above case is
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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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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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Volume occupied by 4.4 gift of carbon dioxide is
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The molecular velocity of any gas is
A. proportional to absolute temperature
B. proportional to the square root of absolute temperature
C. independent of temperature
D. proportional to die square of absolute temperature
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4
In the gas equation PV = xT, x is a constant. The value of the constant depends upon
C. type values of T and P
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22.4 litres of at 27.3°C and 1 atmosphere pressure shall weigh
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An example of covalent solid is
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The number of tetrahedral and octahedral voids per atom in a crystal lattice are, respectively
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The number of atoms in 0.004 gm of magnesium is close to
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What is the vapour pressure of benzoyl chloride at its boiling point (197°C)?