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4

The best electrical conductor of the following is

A. CO2(s)

B. Si(s)

C. NaCl (fused)

D. Br2(I)

Correct Answer :

C. NaCl (fused)


Related Questions

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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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4

An open vessel at 37°C is heated until 3/5 of the air in it has been expelled. Assuming that the volume of the vessel remains constant the temperature to which the vessel is heated is

A. 502°C

B. 502 K

C. 243.67°C

D. 925C

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4

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

A. 2.4 litres

B. 3.6 litres

C. 2.24 litres

D. 11.2 liters

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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

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

In which one of the following does diffusion occur most rapidly?

A. Solid

B. Liquid

C. Gases

D. Gels

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4

Kinetic gas equation is, PV =...

A. nRT

B. 33RT

C. mn1c2

D. 13mnc2

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4

Which one of the following contains same number of molecules as 4.4 gm of carbon dioxide (mol. wt. of CO2 = 44, Mol, wt. of SO2 = 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

The number of tetrahedral and octahedral voids per atom in a crystal lattice are, respectively

A. 1,1

B. 2,2

C. 2,1

D. 2,6

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4

The pressure of the ideal gas is less than the real gas because of the

A. increase in the number of collisions

B. volume occupied by the molecules

C. inter-molecular attraction

D. finite size of molecules

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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

Volume occupied by 1 gm equivalent of oxygen at NTP is

A. 22.4 litres

B. 2.24 litres

C. 5.6 litres

D. 11.2 litres

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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

Correct gas equation is

A. P1V1P2V2=T1T2

B. V1T2P1=P2T1T2

C. P1T1V1=P2T2V2

D. V1V2T1T2=P1P2

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4

The vapour density of ozone would be

A. 72

B. 8

C. 48

D. 24

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4

If the temperature and pressure remain unchanged the volume of O2obtained by the decomposition of a certain volume of SO2 will be

A. Triple the volume of SO2

B. Half the volume of SO2

C. Equal to the volume of SO2

D. One third the volume of SO2

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4

If all the octahedral sites in a cubic close packed arrangement (B-) are completelyfilled with A+ cations, the empirical formula of the compound could then be

A. AB2

B. A2B

C. AB

D. None of these

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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

Match box has the symmetry of which of the following systems?

A. Cubic

B. Orthorhombic

C. Tetragonal

D. Monoclinic

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4

The limiting radii ratio for the tetrahedral geometry is

A. 0.155

B. 0.444

C. 0.732

D. 0.225

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4

Vapour density of a gas is 35.5. The volume occupied by 3.55 gm of the gas at NTPis

A. 1.12 litres

B. 2.24 litres

C. 22.4 litres

D. 11.2 litres

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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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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

Which of the following should be most viscous?

A. CH3OH

B.  CH3CH2OH

C. CH3OCH3

D. HOCH2CH2OH

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4

In a closed packed structure the pattern ABAB...... represents which one of the following:

A. ccp

B. hcp

C. fccp

D. bcc

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4

One gram molecule of a gas at N.T.P occupies 22.4 litres. This fact was derived from

A. Benjamin hypothesis

B. Avogadro's hypothesis

C. Dalton's theory

D. Law of atomic volume

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4

In the ideal gas equation PV = nRT constant 'R' has the unit

A. joule

B. litre/mol

C. lit-atm/deg/mol

D. calorie/mole

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4

Which of the following is an example of covalent network solid?

A. Sodium

B. Solid carbon dioxide

C. Sodium chloride

D. Silicon

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4

The vol. of 20 gms of nitrogen at N.T.P.

A. 16 litres

B. 36 litres

C. 8 litre

D. 32 litres

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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