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4

In anti-fluorite structure the negative ions

A. occupy tetrahedral voids

B. occupy octahedral voids

C. are arranged in ccp

D. are arranged in hcp

Correct Answer :

C. are arranged in ccp


Related Questions

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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

D. None of these

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4

The space occupied by spheres in ccp arrangement is

A. 74.06%

B. 68.05%

C. 60.4%

D. 52.4%

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4

The average kinetic energy of the molecule of SO2 (moL wt. = 64) at 27°C is E. Then the average kinetic energy of CO2 at 27°C is

A. E×6444

B. E×4464

C. E

D. 22E

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The Van der Waal's equation explains the behaviour of

A. ideal gases

B. real gases

C. vapours

D. non-real gases

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The best electrical conductor of the following is

A. CO2(s)

B. Si(s)

C. NaCl (fused)

D. Br2(I)

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4

Number of molecules of carbon dioxide present in 44 gm CO2 is

A. 12 x 1023 approximately

B. 3 x  1010 approximately

C. 6 x  1010 approximately

D. 3 x 1023 approximately

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4

An element has atomic weight 24 and equivalent weight 11.9. Its valency is

A. 1

B. 2

C. 3

D. 4

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The mean free path of a gas molecule is the distance

A. between the two opposite walls of the container

B. through which the molecules travel in one second

C. through which molecules move between two consecutive collisions

D. travelled by all the molecules divided by the total number of molecules in a particular gas

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4

The ratio of RMS velocity to average velocity of a gas molecule at a particular temperature is

A. 1.086:1

B. 1:1.086

C. 2 :1.086

D. 1.086 : 2

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4

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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4

The radii of A+ and X- are 95 pm and 181 pm respectively. Coordination number of A+ is expected to be

A. 8

B. 6

C. 4

D. 3

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Which of the following would you expect to affect the vapour pressure of a liquid?

A. Inter-molecular forces in the liquid

B. Volume of the liquid in the liquid-vapour equilibrium

C. Volume of the vapour in the liquid-vapour equilibrium

D. The size of the container in which liquid-vapour equilibrium is establishe

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4

The electrical conductivity of metals is of the order of

A. 1012ohm-1cm-1

B. 108ohm-1cm-1

C. 102ohm-1cm-1

D. 10-6ohm-1cm-1

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What types of forces are present in molecular solids?

A. electrovalent bonds

B. hydrogen bonds

C. metallic bonds

D. Van der Waal's forces

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An example of covalent solid is

A. diamond

B. NaCl

C. Copper

D. CO2

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What will be the mass of 6.03 x 1023 molecules of carbon monoxide ?

A. 18.00

B. 28.01

C. 56.02

D. 14.05

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4

Boltzmann constant is given by

A. R

B. R+N

C. R:N

D. R-N

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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

A. become half of 740 mm

B. remain unchanged

C. become 1/9 of 740 mm

D. become double of 740 mm

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4

Gases deviate from the ideal behaviour because their molecules

A. possess negligible volume

B. have forces of attraction between them

C. are polyatomic

D. are not attracted to one another

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Of the following properties, the magnitude of one must always increase with temperature. The property is

A. vapour pressure

B. density

C. Hvap

D. surface tension

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4

In anti-fluorite structure the negative ions

A. occupy tetrahedral voids

B. occupy octahedral voids

C. are arranged in ccp

D. are arranged in hcp

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4

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

A. X2Y

B. XY

C. XY2

D. X2Y3

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4

The number of molecules of CO2 present in 44 gms. of CO2 is

A. 6 x 1023 approx

B. 1030 approx

C. 3 x 1010 approx

D. 12 x  1023 approx

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4

At what temperature, the root mean square velocity of oxygen molecules is equal to that of SO2 at 27°C?

A. 150°C

B. 150°K

C. 27°C

D. None of these

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4

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

A. be enlarged

B. be collapse

C. remain unchanged in size

D. have half its volume of the gas

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4

22.4 litres of SO2 at 27.3°C and 1 atmosphere pressure shall weigh

A. 32 g

B. 16 g

C. 44.8 g

D. 48.5 g

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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

A. 3:2:2:1

B. 2:1:2:3

C. 1:2:2:3

D. 1:1:1:1

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4

From the Dulong and Petit's law atomic weight is given by which one of the following relations?

A. 6.41 sp. heat

B. 6.4/sp. heat

C. sp. heat/6.4

D. sp. heat/6.4 x 2

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4

The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure:

A. critical temperature

B. Boyle's temperature

C. inversion temperature

D. reduced temperature

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4

Which of the following is an amorphous solid?

A. NaCl

B.  CaF2

C. Diamond

D. Glass