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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 weight of 11.2 litres of at S.T.P. would be
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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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One mole of gas is defined as
A. The number of molecules in 22.4 litres of gas at S.T.P
B. The number of molecules contained | in 6 grams of 12 C isotope
C. The number of molecules in one formula weight of gas
D. The number of molecules in litre of gas
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4
Kinetic theory of gases postulates :
A. The molecules in a gas are in stationary state
B. The molecules in a gas exert appreciable attraction on each other
C. The molecules move in a random motion with widely different velocities
D. The molecules in a gas collide against each other as well as the wall of the container, but do not change their direction of motion
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In anti-fluorite structure the negative ions
A. occupy tetrahedral voids
B. occupy octahedral voids
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How many moles of water are present in 180 gm. of water ?
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In a closed packed structure the pattern ABAB...... represents which one of the following:
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Vapour density of a gas is 35.5. The volume occupied by 3.55 gm of the gas at NTPis
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22.4 litre of any gas at N.T.P. will contain
B. One gram atomic weight
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The number of atoms per unit cell in simple cubic, face centred cubic and body centred cubic arrangement are, respectively
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In NaCl type structure, the coordination number of the cation and anion are
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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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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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The coordination number of each sphere in hcp arrangement is
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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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The vapour density of pure ozone would be
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How many nearest neighbours are there in an octahedral hole of a close packed structure
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Which of the following methods is used to determine the atomic weight?
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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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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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The vol. of 20 gms of nitrogen at N.T.P.
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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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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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The ratio of RMS velocity to average velocity of a gas molecule at a particular temperature is
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In what ratio by mass carbon monoxide and nitrogen should be mixed so that partial pressure exerted by each gas is same?
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For a given gas at temperature T and pressure P the root mean square velocity (RMS) is C; then at temperature T and pressure 3P the RMS is
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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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1.The correct relationship representing the volume occupied by 44 gm of and 64 gm of at constant temperahire and pressure: