The vapour density of completely dissociated sociated $N H_{4} C L$ would be

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The vapour density of completely dissociated sociated $N H_{4} C L$ would be

A. Determined by the amount of solid $N H_{4} C L$ used in the experiment

B. Triple to that of $N H_{4} C L$

C. Half of that $N H_{4} C L$

D. Slightly less than half of that of $N H_{4} C L$

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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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The best electrical conductor of the following is

A. $C O_{2}$ (s)

B. Si(s)

C. NaCl (fused)

D. $B r_{2}$ (I)

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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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The number of atoms per unit cell in simple cubic, face centred cubic and body centred cubic arrangement are, respectively

A. 8,14,9

B. 1,2,4

C. 1,4,2

D. 8,4, 2

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A liquid of density 1.742 g $c m^{- 3}$ 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 $c m^{- 1}$

B. 4.1 x $10^{3}$ dynes $c m^{- 1}$

C. 7.1 x $10^{- 3}$ dynes $c m^{- 1}$

D. None of these

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The number of N2 molecules present in 28 nitrogen is

A. 2 x 10

B. 6 x $^{10^{22}}$

C. 6 x $^{10^{23}}$ approximately

D. 5 x $^{10^{30}}$ approximately

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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

A. $A B_{5}$

B. $A_{5} B_{2}$

C. $A_{2} B_{5}$

D. $A B$

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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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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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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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The number of molecules is 4.25 g of ammonia are approximately

A. 3.5 x $^{10^{23}}$

B. 2.5 x $^{10^{23}}$

C. 1.5 x $^{10^{23}}$

D. 0.5 x $^{10^{23}}$

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Sodium chloride has fee structure. How many $N a^{+}$ and $C l^{-}$ ions are there in the unit cell?.

A. 6 and 6

B. 4 and 4

C. 1 and 1

D. 6 and 4

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The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends upon the

A. pressure of a gas

B. temperature of the gas

C. volume of the gas

D. pressure, temperature and volume of the gas

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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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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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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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In the process of sublimation, the substance transforms directly

A. from the solid state to the liquid state

B. from the liquid state to gaseous state

C. from the solid state to gaseous state

D. from the liquid state to solid state

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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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The number of molecules in 4.25 gm of ammonia are approximately

A. $0.5 \times 10^{23}$

B. $1.5 \times 10^{23}$

C. $2.5 \times 10^{23}$

D. $3.5 \times 10^{23}$

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In a face centred cubic arrangement of ions, the coordination number of ions is

A. 6

B. 8

C. 12

D. 4

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Which of the following statement wrong?

A. In solid state molecules, atoms or ions are held with a strong force of attraction and are in a fixed position

B. In liquid state the molecules, atom or ions are held with a strong force and have a restricted motion

C. In gaseous states, the molecules are randomly arranged and are apart from each other

D. Solid, liquid and gaseous states have different movement is particles

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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?

A. $m (N_{2}) = m (C O)$

B. $m (N_{2}) = 2 m (C O)$

C. $m (N_{2}) = 0.5 m (C O)$

D. None of these

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In the wurtzite structure sulphur atoms have

A. cubic arrangement

B. hexagonal dose packed arrangement

C. body centred arrangement

D. None of these

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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. $X_{2} Y$

B. XY

C. $X Y_{2}$

D. $X_{2} Y_{3}$

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The coordination number of each sphere in hcp arrangement is

A. 12

B. 8

C. 6

D. 4

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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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What will be the mass of 6.03 x $^{10^{23}}$ molecules of carbon monoxide ?

A. 18.00

B. 28.01

C. 56.02

D. 14.05

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Which of the following is an amorphous solid?

A. NaCl

B. $C a F_{2}$

C. Diamond

D. Glass

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Arrange the following in order of increasing inter-molecular forces and boiling points: $N H_{3}$ ,He, $C l_{2}$

A. $H e < C l_{2} < N H_{3}$

B. $H e > C l_{2} > N H_{3}$

C. $C l_{2} < H e < N H_{3}$

D. $N H_{3} < H e < C l_{2}$

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The average kinetic energy of the molecule of $S O_{2}$ (moL wt. = 64) at 27°C is E. Then the average kinetic energy of $C O_{2}$ at 27°C is

A. $\frac{E \times 64}{44}$

B. $\frac{E \times 44}{64}$

C. E

D. 22E

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Accepted Answer

C. Half of that

N H_{4} C L

The vapour density of completely dissociated sociated $N H_{4} C L$ would be

Correct Answer :

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A liquid of density 1.742 g $c m^{- 3}$ 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

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

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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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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

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The space occupied by spheres in ccp arrangement is

The best electrical conductor of the following is

In zinc blende structure, the zinc atoms occupy

The number of atoms per unit cell in simple cubic, face centred cubic and body centred cubic arrangement are, respectively

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

The number of N2 molecules present in 28 nitrogen is

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

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

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

What types of forces are present in molecular solids?

The number of molecules is 4.25 g of ammonia are approximately

Sodium chloride has fee structure. How many Na+ and Cl- ions are there in the unit cell?.

The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends upon the

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

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

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

In the process of sublimation, the substance transforms directly

Gases deviate from the ideal behaviour because their molecules

The number of molecules in 4.25 gm of ammonia are approximately

In a face centred cubic arrangement of ions, the coordination number of ions is

Which of the following statement wrong?

In what ratio by mass carbon monoxide and nitrogen should be mixed so that partial pressure exerted by each gas is same?

In the wurtzite structure sulphur atoms have

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

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

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The vapour density of completely dissociated sociated $N H_{4} C L$ would be

A liquid of density 1.742 g $c m^{- 3}$ 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

Sodium chloride has fee structure. How many $N a^{+}$ and $C l^{-}$ ions are there in the unit cell?.

What will be the mass of 6.03 x $^{10^{23}}$ molecules of carbon monoxide ?

Arrange the following in order of increasing inter-molecular forces and boiling points: $N H_{3}$ ,He, $C l_{2}$

The average kinetic energy of the molecule of $S O_{2}$ (moL wt. = 64) at 27°C is E. Then the average kinetic energy of $C O_{2}$ at 27°C is