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

Question

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

A. 1

B. 2

C. 3

D. 4

Correct Answer :

B. 2

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

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One mole of gas is defined as

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Normal boiling points values are for $N H_{3}$ , - 34C, bromine 58°C, carbon tetrachloride 77°C and oxygen - 183°C. Which of these liquids has the highest vapour pressure at room temperature?

B. $B r_{2}$

D. $O_{2}$

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

A. Solid

B. Liquid

C. Gases

D. Gels

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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

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

A. 11

B. 5

C. 90

D. 21

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

A. Cubic

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In anti-fluorite structure the negative ions

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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

D. 925C

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What will be the mass of 6.023 x $10^{23}$ molecules of carbon monoxide?

A. 14 gm

B. 28 gm

C. 16 gm

D. 44 gm

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The ionic radii of $M g^{+ 2}$ and $O^{- 2}$ are 0.66 $\overset{°}{A}$ and 1.40 $\overset{°}{A}$ , respectively. The most probable type of gteometry exhibited by MgO on the basis of radius ratio rule is

Discuss this answer

In a dose packed arrangement of N spheres, the number of tetrahedral holes are

A. N

B. 2N

C. N/2

D. $N_{2}$

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The mean free path of a gas molecule is the distance

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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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What is the vapour pressure of benzoyl chloride at its boiling point (197°C)?

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

A. joule

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

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The number of molecules in 4.25 gm of ammonia are approximately

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

Discuss this answer

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

A. Sodium

Discuss this answer

Volume occupied by 4.4 gift of carbon dioxide is

Discuss this answer

Chloroform and benzene form a pair of miscible liquids. These can be separated by

Discuss this answer

A gas or vapour may be liquefied only at a temperature at or

Discuss this answer

The best electrical conductor of the following is

B. Si(s)

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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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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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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

Discuss this answer

Absolute zero is the temperature at which

Discuss this answer

Answer 1

A. 1.086:1

Answer 2

B. 1:1.086

Answer 3

C. 2 :1.086

Answer 4

D. 1.086 : 2

Answer 5

A. 3:2:2:1

Answer 6

B. 2:1:2:3

Answer 7

C. 1:2:2:3

Answer 8

D. 1:1:1:1

Answer 9

A. are above inversion temperature

Answer 10

B. exert no attractive force on each other

Answer 11

C. do work equal to loss in kinetic energy

Answer 12

D. collide without loss of energy

Answer 13

A. The number of molecules in 22.4 litres of gas at S.T.P

Answer 14

B. The number of molecules contained | in 6 grams of 12 C isotope

Answer 15

C. The number of molecules in one formula weight of gas

Answer 16

D. The number of molecules in litre of gas

Answer 17

A.

N H_{3}

,

Answer 18

C.

C C l_{4}

Answer 19

A. be enlarged

Answer 20

B. be collapse

Answer 21

C. remain unchanged in size

Answer 22

D. have half its volume of the gas

Answer 23

B. Orthorhombic

Answer 24

C. Tetragonal

Answer 25

D. Monoclinic

Answer 26

A. occupy tetrahedral voids

Answer 27

B. occupy octahedral voids

Answer 28

C. are arranged in ccp

Answer 29

D. are arranged in hcp

Answer 30

C. 243.67°C

Answer 31

A. NaCl type

Answer 32

B. CsCl type

Answer 33

C. ZnS type

Answer 34

D. Boron oxide type

Answer 35

A. between the two opposite walls of the container

Answer 36

B. through which the molecules travel in one second

Answer 37

C. through which molecules move between two consecutive collisions

Answer 38

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

Answer 39

A. 760 torr

Answer 40

B. 380 torr

Answer 41

C. 197 torr

Answer 42

D. None of these

Answer 43

B. litre/mol

Answer 44

C. lit-atm/deg/mol

Answer 45

D. calorie/mole

Answer 46

A. vapour pressure

Answer 47

B. density

Answer 48

C.

∆ H_{v a p}

Answer 49

D. surface tension

Answer 50

A.

0.5 \times 10^{23}

Answer 51

B.

1.5 \times 10^{23}

Answer 52

C.

2.5 \times 10^{23}

Answer 53

D.

3.5 \times 10^{23}

Answer 54

A. Inter-molecular forces in the liquid

Answer 55

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

Answer 56

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

Answer 57

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

Answer 58

B. Solid carbon dioxide

Answer 59

C. Sodium chloride

Answer 60

D. Silicon

Answer 61

A. 4.4 litres

Answer 62

B. 2.24 litres

Answer 63

C. 22.4 litres

Answer 64

D. 4.48 litres

Answer 65

A. a separating funnel

Answer 66

B. distillation

Answer 67

C. sublimation

Answer 68

D. filtration

Answer 69

A. below the critical temperature

Answer 70

B. above the critical temperature

Answer 71

C. above the normal boiling point

Answer 72

D. at any temperature

Answer 73

A.

C O_{2}

(s)

Answer 74

C. NaCl (fused)

Answer 75

D.

B r_{2}

(I)

Answer 76

A. 4.1 x

^{10^{- 2}}

dynes

c m^{- 1}

Answer 77

B. 4.1 x

10^{3}

dynes

c m^{- 1}

Answer 78

C. 7.1 x

10^{- 3}

dynes

c m^{- 1}

Answer 79

D. None of these

Answer 80

A. water freezes

Answer 81

B. all gases become liquid

Answer 82

C. all substances are solid

Answer 83

D. molecular motion ceases

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

Correct Answer :

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

Correct Answer :

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