Q.1

Which of the following expressions defines the Baume gravity scale for liquids lighter than water ?

  • °Be = (140/G) - 130
  • °Be = 200(G-1)
  • °Be = 145 - (145/G)
  • °Be = (400/G) - 400
Q.2

Which of the following is not a unit of pressure?

  • Parsec
  • Kilo-pascal
  • Bar
  • Newton/metre2
Q.3

The atomic heat capacities of all solid elements __________ with decrease in temperature.

  • increases
  • decreases
  • remains unchanged
  • approach zero at 0°C
Q.4

The OH- concentration in a solution having pH value 3 is

  • 10-3
  • 10-10
  • 10-11
  • 10-13
Q.5

Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the

  • recycling
  • purging
  • bypassing
  • recirculation
Q.6

2 litres of nitrogen at N.T.P. weighs __________ gms.

  • 14
  • 2.5
  • 28
  • 1.25
Q.7

Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

  • sizes of the component molecules are approximately equal.
  • attractive forces between like and unlike molecules are approximately equal.
  • component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution.
  • all (a), (b) & (c).
Q.8

A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of

  • 3
  • 100
  • 1000
  • none of these
Q.9

Which of the following is followed by an ideal solution ?

  • Boyle's law
  • Amgat's law
  • Raoult's law
  • Trouton's rule
Q.10

°API gravity of water at N.T.P. is about

  • 0
  • 1
  • 10
  • 100
Q.11

The vapor pressure of the solvent decreased bymm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to bemm Hg. ?

  • 0.2
  • 0.1
  • 0.4
  • 0.6
Q.12

A gas occupies a volume ofc.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
Q.13

Cp/Cv for monoatomic gases is

  • 1.44
  • 1.66
  • 1.99
  • 1
Q.14

One of the specific gravity scales is "Brix" (used speicifically for sugar solution). It is defined as

  • Brix = (400/G) - 400
  • Brix = 200 (G-1)
  • Brix = 145 - (145/G)
  • none of these
Q.15

Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution).

  • none of these
Q.16

Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution).

  • none of these
Q.17

A gas occupies a volume ofc.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
Q.18

Pick out the wrong statement.

  • Ten times dilution of a normal solution (N) reduces its normality to N/10.
  • When equal weights of oxygen and methane are mixed in an empty reactor at room temperature, then the fraction of total pressure exerted by the oxygen is 1/2.
  • Volume occupied by 9.034 x 1023 atoms of oxygen in ozone (O3) at NTP will be 11200 c.c
  • One kg mole of an ideal gas at N.T.P occupies 22400 Nm3.
Q.19

In the reaction, represented by Na2CO3 + HC1 → NaHO3 + NaCl, the equivalent weight of Na2CO3 is

  • 53
  • 5.3
  • 106
  • 10.6
Q.20

Pick out the wrong statement.

  • To make 100 kg of a solution containing 40% salt by mixing solution A (containing 25% salt) and solution B (containing 50% salt), the amount of solution A required is 40 kg.
  • 1.2 gm atoms of carbon and 1.5 gm moles of oxygen are reacted to give 1 gm mole of carbon dioxide. The limiting reactant is carbon. The percent excess reactant supplied is 25.
  • A gas bubble at a pressure of Pg is passed through a solvent with a saturation vapour pressure of Ps. If the time of passage of the bubble is long and air is insoluble in the solvent, the mole fraction of solvent in the bubble will be equal to Ps/Pg.
  • A supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystalliser at a volumetric flow rate of V. The solubility .of the solute is C1. The output rate of solids from an efficient crystalliser is (C + C1) V.
Q.21

The heats of vaporisation of CS2, C2H5OH &H2O are 26.38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is

  • H2O > C2H5OH > CS2
  • CS2 > C2H5OH > H2O
  • H2O > CS2 > C2H5OH
  • CS2 > H2O > C2H5OH
Q.22

The number of water molecules present in a drop of water weighing 0.gm is 6.x __________

  • 1026
  • 1023
  • 1020
  • 1019
Q.23

Kopp's rule is helpful in finding the

  • heat capacities of solids.
  • heat capacities of gases.
  • molal heat capacities of gases.
  • activation energy.
Q.24

The reverse process of fractional crystallisation is called

  • stripping
  • leaching
  • differential distillation
  • absorption
Q.25

Ideal solution is formed, when its components have zero

  • heat of mixing.
  • volume change.
  • both (a) & (b).
  • neither (a) nor (b).
Q.26

Pick out the correct conversion.

  • 1 BTU =453.6 calories
  • 1 BTU = 252 calories
  • 1 calorie = 252 BTU
  • 1 calorie = 453.6 BTU
Q.27

The temperature of a gas in a closed container isC. If the temperature of the gas is incresed toC, then the pressure exerted is

  • doubled.
  • halved.
  • trebled.
  • unpredictable.
Q.28

A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal

  • kinetic energy.
  • intermolecular forces of attraction.
  • potential energy.
  • total energy.
Q.29

The density of a liquid iskg/m3. Its value in gin/litre will be equal to

  • 1.5
  • 15
  • 150
  • 1500
Q.30

In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is

  • independent of the temperature.
  • increased with the increase in pressure.
  • decreased with the increase in pressure.
  • unchanged by the pressure change.
  • none of these
Q.31

1 gm mole of methane (CH4) contains

  • 6.02 x 1023 atoms of hydrogen.
  • 4 gm atoms of hydrogen.
  • 3.01 x 1023 molecules of methane.
  • 3 gms of carbon.
Q.32

1 BTU/ft3 is approximately equal to __________ kcal/m3.

  • 1
  • 9
  • 4
  • 252
Q.33

Addition of a non-volatile solute to a solvent produces a __________ in its solvent.

  • freezing point elevation
  • boiling point depression
  • vapor pressure lowering
  • all (a), (b) & (c)
Q.34

Total energy at a point comprises of __________ energy.

  • potential & kinetic
  • pressure
  • internal
  • all (a), (b) & (c).
Q.35

The unit of specific heat at constant pressure, Cp, in SI unit is

  • W/m2°C
  • J/kg°K
  • W/m°K
  • J/m3°K
Q.36

Pick out the wrong statement:

  • A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure.
  • A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a 'superheated vapor'.
  • The temperature at which a vapor is saturated is termed as the boiling point.
  • The difference between the existing temperature of a vapor and its saturation temperature (i.e. dew point) is called its 'degree of superheat'.
Q.37

'Giga' stands for

  • 109
  • 10-12
  • 1012
  • 1015
Q.38

For estimation of heat capacity of a solid compound, one can use

  • Clayperon's equation
  • Gibb's equation
  • Kopp's rule
  • Trouton's rule
Q.39

The maximum adiabatic flame temperature of fuels in air is __________ the maximum flame temperature in pure oxygen.

  • lower than
  • higher than
  • same as
  • not related to
Q.40

Isotonic solutions must have the same

  • viscosity
  • molar concentration
  • normality
  • critical temperature
Q.41

Pure aniline is evaporating through a stagnant air film of 1 mm thickness atK and a total pressure ofKPa. The vapor pressure of aniline atK is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3 . The diffusivity of aniline in air is 0.74xl0-5m2/s.The numerical value of mass transfer co-efficient is 7.4 x 10-3. Its units are

  • m/s
  • cm/s
  • mole/m2.s.Pa
  • kmole/m2.s.Pa
Q.42

The heat of vaporisation __________ with increase in pressure.

  • increases
  • decreases
  • becomes zero at critical pressure
  • both (b) and (c)
Q.43

What is the total pressure exerted by a mixture of 0.kg mole of benzene, 0.kg mole of toluene and 0.kg mole of o-xylene at 100°C, if their vapor pressures at 100°C areandmmHg respectively ?

  • 756.2
  • 780.5
  • 801.5
  • 880.5
Q.44

Weight oflitres of ammonia at N.T.P. is __________ gm.

  • 2.5
  • 42.5
  • 56
  • 2800
Q.45

The latent heat of vaporisation

  • decreases with increased temperature.
  • decreases as pressure increases
  • becomes zero at the critical point.
  • all (a), (b) & (c).
Q.46

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

  • litre
  • kg
  • gm mole
  • gm
Q.47

Number of gm moles of solute dissolved in one litre of a solution is called its

  • equivalent weight
  • molarity
  • molality
  • normality
Q.48

A chemical process is said to occur under unsteady state, if the

  • inventory changes do not take place.
  • ratio of streams entering/leaving are independent of time.
  • flow rates & composition both are time dependent.
  • none of these.
Q.49

At 100°C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100°C, the latent heats of vaporisation of these compounds are 40.kJ/mole for water and 31.kJ/mole for methylcyclohexane. The vapour pressure of water at 150°C is 4.atm. At 150°C, the vapour pressure of methylcyclohexane would be expected to be

  • significantly less than 4.69 atm.
  • nearly equal to 4.69 atm.
  • significantly more than 4.69 atm.
  • indeterminate due to lack of data
Q.50

Recycling in a chemical process facilitates

  • increased yield
  • enrichment of product
  • heat conservation
  • all (a), (b) &(c)
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