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What is the correct answer?

4

The number of molecules is 4.25 g of ammonia are approximately

A. 3.5 x 1023

B. 2.5 x 1023

C. 1.5 x 1023

D. 0.5 x 1023

Correct Answer :

D. 0.5 x 1023


Related Questions

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4

The molecular velocity of any gas is

A. proportional to absolute temperature

B. proportional to the square root of absolute temperature

C. independent of temperature

D. proportional to die square of absolute temperature

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4

The vapour density of pure ozone would be

A. 32

B. 8

C. 12

D. 24

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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

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

Molecular formula of D in the above case is

A. AB5

B. A5B2  

C. A2B5 

D. AB

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4

The number of molecules is 4.25 g of ammonia are approximately

A. 3.5 x 1023

B. 2.5 x 1023

C. 1.5 x 1023

D. 0.5 x 1023

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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

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

D. at any temperature

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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

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

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

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

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

A. AB5

B. A5B2

C.  A2B5

D. AB

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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

Cubic close packed arrangement of ions is described as

A. ABC AB ABC.....

B. ABC ABC......

C. AB AB..........

D. ABC CBA...

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4

Which of the following contains the same number of atoms as 12 gms: of Magnesium (Atomic weights : Mg = 24, C = 12, Ca = 40)

A. 10 gms of calcium

B. 20 gms of carbon

C. 20 gms of calcium

D. 12 gms of carbon

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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

The wt. of 2.8 litres of a gas at N.T.P. is 3.50 gms. Its V.D. is

A. 20

B. 28

C. 32

D. 14

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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

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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4

In NaCl type structure, the coordination number of the cation and anion are

A. 6 and 4

B. 6 and 6

C. 4 and 4

D. 8 and 4

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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

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

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

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 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

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 number of N2 molecules present in 28 nitrogen is

A. 2 x 10

B. 6 x 1022

C. 6 x 1023 approximately

D. 5 x 1030 approximately

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4

How many nearest neighbours are there in an atom or ion in an octahedral hole of a close packed structure?

A. 4

B. 6

C. 8

D. 18

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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