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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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4
Correct gas equation is
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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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Which of the following methods is used to determine the atomic weight?
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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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The number of molecules in 4.25 gm of ammonia are approximately
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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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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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What will be the mass of 6.03 x molecules of carbon monoxide ?
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In the ideal gas equation PV = nRT constant 'R' has the unit
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What types of forces are present in molecular solids?
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In a solid atoms A are arranged in ccp array. Atoms B occupy all the octahedral voids and half the tetrahedral voids. The formula of the compound is expected to be
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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 space occupied by spheres in ccp arrangement is
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The vol. of 20 gm. of hydrogen at N.T.P. is
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In which one of the following does diffusion occur most rapidly?
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What will be the mass of 6.023 x molecules of carbon monoxide?
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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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A chalk box exhibits
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The electrical conductivity of metals is of the order of
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Three dimensional array of points in space is called
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Arrange the following in order of increasing inter-molecular forces and boiling points:,He,
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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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The vapour density of pure ozone would be
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From the Dulong and Petit's law atomic weight is given by which one of the following relations?
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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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The number of atoms per unit cell in bcc arrangement is
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Which of the following should be most viscous?
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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 ?