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At 303 K ethanol has a vapour pressure of about 0.118 atm., acetic acid has the vapour pressure of about 0.039 atm., and ethyl iodide has a vapour pressure of about 0.263 atm. Which of the following represents the correct order of increasing normal boiling point ?
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4
Absolute zero is the temperature at which
B. all gases become liquid
C. all substances are solid
D. molecular motion ceases
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4
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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4
What will be the mass of 6.023 x molecules of carbon monoxide?
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How many moles of water are present in 180 gm. of water ?
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To which of the following mixtures is the Dalton's law of partial pressures not applicable?
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The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends upon the
B. temperature of the gas
D. pressure, temperature and volume of the gas
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The weight of 11.2 litres of at S.T.P. would be
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The number of molecules in 4.25 gm of ammonia are approximately
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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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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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Vapour density of a gas is 35.5. The volume occupied by 3.55 gm of the gas at NTPis
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Equal weights of methane and hydrogen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by methane is
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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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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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Which of the following statement wrong?
A. In solid state molecules, atoms or ions are held with a strong force of attraction and are in a fixed position
B. In liquid state the molecules, atom or ions are held with a strong force and have a restricted motion
C. In gaseous states, the molecules are randomly arranged and are apart from each other
D. Solid, liquid and gaseous states have different movement is particles
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At what temperature, the root mean square velocity of oxygen molecules is equal to that of at 27°C?
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The number of atoms per unit cell in simple cubic, face centred cubic and body centred cubic arrangement are, respectively
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The number of tetrahedral and octahedral voids per atom in a crystal lattice are, respectively
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In NaCl type structure, the coordination number of the cation and anion are
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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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Which compound possesses greatest lattice energy?
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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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Density of a gas relative to air is 2.3. If the average molar mass of air is 29.08/mol, the molecular mass of the gas will be
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How many nearest neighbours are there in an octahedral hole of a close packed structure
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Which of the following is an example of covalent network solid?
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Cubic close packed arrangement of ions is described as
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The number of N2 molecules present in 28 nitrogen is
C. 6 x approximately
D. 5 x approximately
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22.4 litres of at 27.3°C and 1 atmosphere pressure shall weigh
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When there is more deviation in the behaviour of a gas from ideal gas equation PV = nRT
A. at high temperature and low pressure
B. at low temperature and high pressure
C. at high temperature and high pressure
D. at low temperature and low pressure