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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 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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4
Four 1 litre flasks are separately filled with hydrogen, helium, oxygen and ozone gases at the same temperature and pressure. The ratio of total number of atoms of these gases present in the different flasks would be
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4
Which of the following is an amorphous solid?
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Gases deviate from the ideal behaviour because their molecules
A. possess negligible volume
B. have forces of attraction between them
D. are not attracted to one another
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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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What is the vapour pressure of benzoyl chloride at its boiling point (197°C)?
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The vapour density of completely dissociated sociated would be
A. Determined by the amount of solid used in the experiment
B. Triple to that of
D. Slightly less than half of that of
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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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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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4
According to Avogadro's hypothesis equal volumes of two gases under the same conditions of temperature and pressure contain
A. Equal number of electrons
D. Equal number of molecules
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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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What will be the mass of 6.03 x molecules of carbon monoxide ?
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The ionic radii of and ions are 1.47 and 1.95 , respectively. The most probable type of geometry exhibited by RbBr on the radius ratio rule is
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The number of molecules in 4.25 gm of ammonia are approximately
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The number of molecules is 4.25 g of ammonia are approximately
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The ratio of RMS velocity to average velocity of a gas molecule at a particular temperature is
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The Van der Waal's equation explains the behaviour of
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Three dimensional array of points in space is called
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Which of the following is an example of covalent network solid?
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An element has atomic weight 24 and equivalent weight 11.9. Its valency is
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An example of covalent solid is
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The number of molecules of present in 44 gms. of is
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In the ideal gas equation PV = nRT constant 'R' has the unit
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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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4
Four 1 litre flasks are separately filled with the gases hydrogen, helium, oxygen and ozone at the same temperature and pressure, the ratio of total number of atoms of these gases present in the different flasks would be
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4
7.Which of the following sets of conditions represent the easiest way to liquefy a gas?
A. Low temperature and high pressure
B. High temperature and low pressure
C. High temperature and low pressure
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4
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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Which compound possesses greatest lattice energy?
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How many moles of water are present in 180 gm. of water ?