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4

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

A. AB2

B. AB3

C. A2B3

D. A2B

Correct Answer :

A. AB2


Related Questions

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4

Kinetic gas equation is, PV =...

A. nRT

B. 33RT

C. mn1c2

D. 13mnc2

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4

Lattice energy of a solid is high if

A. the radii of the ions are large

B. radii of the ions are small

C. charge on the ions are small

D. the ions are neutral

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4

What will be the mass of 6.023 x 1023 molecules of carbon monoxide?

A. 14 gm

B. 28 gm

C. 16 gm

D. 44 gm

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4

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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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

A liquid of density 1.742 g cm-3 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

A. 4.1 x 10-2 dynes cm-1

B. 4.1 x 103 dynes cm-1

C. 7.1 x 10-3 dynes cm-1

D. None of these

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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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6.If the reactants and products both are in gaseous phase they bear a simple ratio in their

A. volumes

B. molecules

C. atoms

D. temperature

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An example of covalent solid is

A. diamond

B. NaCl

C. Copper

D. CO2

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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

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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4

Which of the following is an amorphous solid?

A. NaCl

B.  CaF2

C. Diamond

D. Glass

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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

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

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

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

A. 2M

B. 4M

C. 8M

D. M/4

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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

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 ?

A. CH3COOH<C2H5OH<C2H5I

B. C2H5I<CH3COOH<C2H5OH

C. C2H5I<C2H5OH<CH3COOH

D. C2H5OH<C2H5I<CH3COOH

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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

Which compound possesses greatest lattice energy?

A. LiF

B. NaF

C. KF

D. CsF

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4

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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4

How many moles of water are present in 180 gm. of water ?

A. 11

B. 5

C. 90

D. 21

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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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4

In zinc blende structure, the zinc atoms occupy

A. all tetrahedral sites

B. all octahedral sites

C. half of the octahedral sites

D. half of the tetrahedral sites

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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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4

20 litres of hydrogen gas weighs about

A. 1.8 g

B. 3.6 g

C. 224 g

D. 12.2 g

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The vapour density of a gas in 35.5. The volume occupies by 3.55 gms of the gas at N.T.P. is

A. 224 litres

B. 2.24 litres

C. 11.12 litres

D. 1.12 litres

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4

5.At a given temperature and pressure 2 volumes of A combine with 5 volumes of B to form 2 volmes of C and 1 volume. A combine with one volume of B to form 2 volumes of D. The formula of C is

A. A3B6

B. AB

C. A2B5

D. AB5

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4

The molecular weight of a volatile liquid can be determined by

A. Dumas' method

B. Victor Meyer's method

C. Cryoscopic method

D. Osmotic pressure

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4

How many nearest neighbours are there in an octahedral hole of a close packed structure

A. 4

B. 6

C. 8

D. 12