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An element has atomic weight 24 and equivalent weight 11.9. Its valency is
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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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The vapour density of a gas is 11.2. The volume occupied by 2.4 g of the gas at S.T.P wil be
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What will be the mass of 6.023 x molecules of carbon monoxide?
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Certain volume of a gas exerts on its walls some pressure at a particular temperature. It has been found that by reducing the volume of the gas to half its original value, the pressure becomes I twice that the initial value of constant temperature. This happens because
A. More number of a gas molecules strike the surface per second
B. Velocity of the gas molecules increases
C. Gas molecules attract each other
D. Weight of the gas increase with volume
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In which one of the following does diffusion occur most rapidly?
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Kinetic gas equation is, PV =...
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Which one of the following contains same number of molecules as 4.4 gm of carbon dioxide (mol. wt. of = 44, Mol, wt. of = 64)?
A. 64 gm of sulphur dioxide
B. 4.4 gm of sulphur dioxide
C. 6.4 gm of sulphur dioxide
D. 3.2 gm of sulphur dioxide
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The number of tetrahedral and octahedral voids per atom in a crystal lattice are, respectively
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The pressure of the ideal gas is less than the real gas because of the
A. increase in the number of collisions
B. volume occupied by the molecules
C. inter-molecular attraction
D. finite size of molecules
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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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Volume occupied by 1 gm equivalent of oxygen at NTP is
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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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Correct gas equation is
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The vapour density of ozone would be
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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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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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Which of the following is an amorphous solid?
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Match box has the symmetry of which of the following systems?
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The limiting radii ratio for the tetrahedral geometry is
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Vapour density of a gas is 35.5. The volume occupied by 3.55 gm of the gas at NTPis
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The electrical conductivity of metals is of the order of
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The Van der Waal's equation explains the behaviour of
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Which of the following should be most viscous?
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In a closed packed structure the pattern ABAB...... represents which one of the following:
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One gram molecule of a gas at N.T.P occupies 22.4 litres. This fact was derived from
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In the ideal gas equation PV = nRT constant 'R' has the unit
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Which of the following is an example of covalent network solid?
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The vol. of 20 gms of nitrogen at N.T.P.
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In a solid atoms A are arranged in ccp array. Atoms B occupy all the octahedral voids and half the tetrahedral voids. The formula of the compound is expected to be