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Q1. | The reverse process of fractional crystallisation is called |

A. | stripping [Wrong Answer] |

B. | leaching [Correct Answer] |

C. | differential distillation [Wrong Answer] |

D. | absorption [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ In a binary liquid system, the composition expressed as __________ is independent of the temperature & pressure.

kg of solute/kg of solvent

kg-mole of solute/kg-mole of solvent

kg-mole of solute/1000 kg of solvent

all (a), (b) & (c)

⇒ A vessel of volume 1000 m

^{3}contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately

17

20

25

34

⇒ If 1.5 moles of oxygen combines with aluminium to form Al

_{2}O

_{3}, then the weight of aluminium (atomic weight = 27 ) used in this reaction is __________ gm.

27

54

5.4

2.7

⇒ A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is

2

1

0.5

0.5

⇒ PH value of an alkaline solution is

7

> 7

< 7

constant over a wide range

⇒ 1 kg of calcium carbide (CaC

_{2}) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ?

5

10

15

20

⇒ The equilibrium data of component

*A*in the two phases

*B*and

*C*are given bel

15.5

16

16.5

17

⇒ Except for monoatomic gases, the molal heat capacity at constant volume for all gases is __________ Kcal/Kg mole.° K.

3

> 3

< 3

< 1

⇒ Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ?

Chlorine

Nitrogen

Ethane

All the gases will have the same KE

⇒ Kopp's rule is helpful in finding the

heat capacities of solids.

heat capacities of gases.

molal heat capacities of gases.

activation energy.

⇒ At what temperature, given mass of a gas that occupies a volume of 2 litres at N.T.P. will occupy a volume of 4 litres, if the pressure of the gas is kept constant ?

273°C

273°K

100°C

200°C

⇒ The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation

increases with pressure rise.

decreases with increasing pressure.

becomes zero at the critical point.

both (b) & (c).

⇒ Normality of a solution does not change with the increase in the

pressure

temperature

solute concentration

dilution of the solution

⇒

*C*for monoatomic gases is equal to(where,

_{v}*R*= gas constant)

*R*

1.5

*R*

2

*R*

3

*R*

⇒ Pick out the wrong unit conversion of calorific value.

1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg.

1 BTU/ft

^{3}= 8.9 kcal/m

^{3}= 0.038 MJ/m

^{3}.

1 BTU/lb = 2.3 kcal/kg.

1 kcal/m

^{3}= 0.1124 BTU/ft

^{3}.

⇒ Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the

nature of the liquid.

nature of the gas.

temperature of the liquid. id) total pressure.

⇒ The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is

0.4

0.6

0.8

0.2

⇒ 40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is

42737

42738

42739

42769

⇒ Molality is defined as the number of gm moles of solute per __________ of solvent.

litre

kg

gm mole

gm

⇒ Viscosity of atmospheric air may be about __________ centipoise.

0.015

1.5

15

150

⇒ One micron is equal to __________ cm.

10

^{-2}

10

^{-4}

10

^{-6}

10

^{-8}

⇒ The total number of atoms in 8.5 gm of NH

_{3}is __________ x 10

^{23}.

9.03

3.01

1.204

6.02

⇒ The number of atoms of oxygen present in 11.2 litres of ozone (O

_{3}) at N.T.P. are

3.01 x 10

^{22}

6.02 x 10

^{23}

9.03 x 10

^{24}

1.20 x 10

^{24}

⇒ Pick out the wrong unit conversion.

1 Joule = 4.186 calorie.

1 kcal = 3.968 BTU = 0.00116 kWh = 0.00156 hp.

1 ton of TNT (tri-nitro-toluene) = 4.2 GJ (1G = 10

^{9}).

1 ft.lbf= 0.3238 calorie = 0.1383 kg.m = 1.356 J = 1.356 N.m.

⇒ Equal masses of CH

_{4}and H

_{2}are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is

42744

42956

42737

42864

⇒ A gas occupies a volume of 283 c.c at 10°C. If it is heated to 20°C at constant pressure, the new volume of the gas will be __________ c.c.

283

566

293

141.5

⇒ 1 centipoise is equivalent to

1 gm/cm.second

1 centistoke

2.42 lb/ft.hr

2.42 lb/ft.second

⇒ __________ equation gives the effect of temperature on heat of reaction.

Kirchoffs

Maxwell's

Antonie

Kistyakowsky

⇒ One 'Therm' is equivalent to

10

^{5}BTU

10

^{5}kcal

10

^{9}BTU

10

^{9}kcal

⇒ In osmosis through a semi-permeable membrane, diffusion of the

solvent is from low concentration to high concentration region.

solvent is from high concentration to low concentration region.

solute takes place.

none of these.