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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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Normal boiling points values are for , - 34C, bromine 58°C, carbon tetrachloride 77°C and oxygen - 183°C. Which of these liquids has the highest vapour pressure at room temperature?
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4
The limiting radii ratio for the tetrahedral geometry is
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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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4
20 litres of hydrogen gas weighs about
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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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How many nearest neighbours are there in an octahedral hole of a close packed structure
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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 of the following will have low heat of fusion?
D. a network of covalent solid
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The vapour density of pure ozone would be
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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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In a close packed arrangement of N spheres, the number of octahedral holes are
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The molecular weight of a volatile liquid can be determined by
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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 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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In fluorite structure coordination number of calcium ions 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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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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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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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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4
In anti-fluorite structure the negative ions
A. occupy tetrahedral voids
B. occupy octahedral voids
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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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In the wurtzite structure sulphur atoms have
B. hexagonal dose packed arrangement
C. body centred arrangement
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The number of tetrahedral and octahedral voids per atom in a crystal lattice are, respectively
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The coordination number of each sphere in hcp arrangement 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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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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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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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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Avogadro stated that under similar conditions of temperature and pressure equal volumes of all gases contain equal number of