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4
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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4
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
The number of atoms in 0.004 gm of magnesium is close to
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4
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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4
The coordination number of each sphere in hcp arrangement is
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4
The best electrical conductor of the following is
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Indicate the most volatile liquid of the following:
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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 number of atoms per unit cell in bcc arrangement is
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Sodium chloride has fee structure. How many and ions are there in the unit cell?.
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The limiting radii ratio for the tetrahedral geometry is
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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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The number of tetrahedral and octahedral voids per atom in a crystal lattice are, respectively
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Avogadro stated that under similar conditions of temperature and pressure equal volumes of all gases contain equal number of
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4
Number of molecules of carbon dioxide present in 44 gm is
A. 12 x approximately
B. 3 x approximately
C. 6 x approximately
D. 3 x approximately
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4
At a given temperature and pressure 2 volumes of A combine with 5 volumes of B to form 2 volumes of C, and 1 volume of A combines with one volume of B to form 2 volumes of D. Then the formula of C 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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The electrical conductivity of metals is of the order of
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Cubic close packed arrangement of ions is described as
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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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4
An example of covalent solid 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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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 vapour density of a gas in 35.5. The volume occupies by 3.55 gms of the gas at N.T.P. 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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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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4
Volume occupied by 4.4 gift of carbon dioxide is
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The wt. of 2.8 litres of a gas at N.T.P. is 3.50 gms. Its V.D. is
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The vol. of 20 gm. of hydrogen at N.T.P. is