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The number of molecules in 4.25 gm of ammonia are approximately
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In a face centred cubic arrangement of ions, the coordination number of ions is
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4
When an ideal gas undergoes unrestricted expansion, no cooling occurs because the molecules
A. are above inversion temperature
B. exert no attractive force on each other
C. do work equal to loss in kinetic energy
D. collide without loss of energy
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4
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
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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4
The radii of and are 95 pm and 181 pm respectively. Coordination number of is expected to be
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Which of the following phrases would be incorrect to use?
C. A molecule of a compound
D. A molecule of an element
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Sodium chloride has fee structure. How many and ions are there in the unit cell?.
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What will be the mass of 6.03 x molecules of carbon monoxide ?
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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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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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The electrical conductivity of metals is of the order of
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The V.D. of a gas is 11.2 gm. The volume occupied by 11.2 gm. of this gas at N.T.P. is
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What is the vapour pressure of benzoyl chloride at its boiling point (197°C)?
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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 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 vapour density of ozone would be
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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
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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Boltzmann constant is given by
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Chloroform and benzene form a pair of miscible liquids. These can be separated by
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In which one of the following does diffusion occur most rapidly?
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Which of the following is an amorphous solid?
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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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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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An element has atomic weight 24 and equivalent weight 11.9. Its valency is
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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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The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure:
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Which of the following methods is used to determine the atomic weight?
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Avogadro stated that under similar conditions of temperature and pressure equal volumes of all gases contain equal number of