Q.1

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).
Q.2

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
Q.3

For an ideal solution, the total vapor pressure varies __________ with the composition(expressed as mole fraction).

  • inversely
  • exponentially
  • linearly
  • negligibly
Q.4

Pick out the wrong statement.

  • Atomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong.
  • Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state.
  • Generally, the heat capacities of compounds are lower in the liquid than in the solid state.
  • The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist.
Q.5

1 gm mole of an alcohol whose molecular weight iscontainsgms of carbon,gms of hydrogen andgms of oxygen. Its molecular formula is

  • C4H9OH
  • C3H21OH
  • (C2H4)2H2.OH
  • C2H33OH
Q.6

A solution with reasonably permanent pH is called a/an __________ solution.

  • ideal
  • non-ideal
  • buffer
  • colloidal
Q.7

One kg of saturated steam at 100°C and 1.bar is contained in a rigid walled vessel. It lias a volume of 1.m3. It cools to 98°C ; the saturation pressure is 0.bar ; one kg of water vapour under these conditions has a volume of 1.m3. The latent heat of condensation (kJ/kg-1 ) under these conditions is

  • 40732
  • 2676
  • 2263
  • 540
Q.8

The vapor pressure of a substance, at its melting point, is __________ in the solid state as compared to that in the liquid state.

  • less
  • more
  • same
  • either (a) or (b); depends on the nature of the substance
Q.9

The value of gas constant 'R' is __________ kcal/kg.mole.°C.

  • 2.79
  • 1.987
  • 3.99
  • none of these
Q.10

'Cox' chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the

  • temperature vs. log (vapor pressure).
  • vapor pressure vs. log (temperature).
  • log (temperature) vs. log (vapor pressure).
  • vapor pressure vs. temperature.
Q.11

NaOH contains __________ percent oxygen.

  • 1
  • 10
  • 16
  • 40
Q.12

One micron is equal to __________ cm.

  • 10-2
  • 10-4
  • 10-6
  • 10-8
Q.13

A vapor that exists above its critical temperature is termed as a __________ vapor.

  • saturated
  • unsaturated
  • gaseous
  • sub-cooled
Q.14

Heat of transition is the heat evolved or absorbed, when a substance is converted from

  • vapor to liquid.
  • vapor to solid.
  • solid to liquid.
  • one allotropic form to another allotropic form.
Q.15

Size range of the colloidals particles is

  • 5 - 200 milli-microns
  • 50 - 200 microns
  • 500 - 1000 microns
  • 10 - 50 Angstrom
Q.16

1 torr is equal to __________ mm Hg column.

  • 1
  • 0.1
  • 10
  • 1000
Q.17

For a neutral solution (pH = 7), the value of[H+] [OH-] is equal to

  • 0
  • 1
  • < 1
  • > 1
Q.18

1 kg/m2 is equal to __________ mm water column.

  • 1
  • 10
  • 100
  • 1000
Q.19

Measurement of the amount of dry gas collected over water from volume of moist gas is based on the

  • Charle's law.
  • Dalton's law of partial pressures.
  • Avogadro's hypothesis.
  • Boyle's law.
Q.20

The value of Trouton's ratio (λb/Tb) for a number of substances is(where, λb = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, °K). The Kis-tyakowsky equation is used for calculation of Trouton's ratio of __________ liquids.

  • polar
  • non-polar
  • both (a) & (b)
  • neither (a) nor (b)
Q.21

Heat of __________ of a fuel is called its calorific value.

  • formation
  • combustion
  • reaction
  • vaporisation
Q.22

Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume 'X' diffuses twice as fast as another perfume 'Y'; what is the molecular weight of 'Y', if the vapor density of gas 'X' is 2 ? Molecular weight of gas 'X' is to be assumed to be 2.

  • 2
  • 4
  • 8
  • 16
Q.23

Heat of transition is the heat evolved or absorbed, when a substance is converted from

  • vapor to liquid.
  • vapor to solid.
  • solid to liquid.
  • one allotropic form to another allotropic form.
Q.24

Which of the following gravity scales is used exclusively for liquids heavier than water ?

  • Baumme scale
  • Twaddel scale
  • API scale
  • none of these
Q.25

For any system, the __________ heat of solution is dependent on the temperature and the adsorbate concentration.

  • integral
  • differential
  • both (a) & (b)
  • neither (a) nor (b)
Q.26

An equation for calculating vapour pressure is given by, log10 P = A - B(t + c). This is called the

  • Kistyakowsky equation
  • Antonic equation
  • Kopp's rule
  • Trouton's rule
Q.27

The value of the gas-law constant 'R' is 1.987

  • kcal/kg-mole.°C
  • Btu/lb-mole.°R
  • kcal/kg-mole.°K
  • both (b)& (c)
Q.28

In physical adsorption, as compared to chemisorption, the

  • quantity adsorbed per unit mass is higher.
  • rate of adsorption is controlled by the resistance to surface reaction.
  • activation energy is very high.
  • heat of adsorption is very large.
Q.29

Size range of the colloidals particles is

  • 5 - 200 milli-microns
  • 50 - 200 microns
  • 500 - 1000 microns
  • 10 - 50 Angstrom
Q.30

Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm.

  • 1
  • 2
  • 3
  • 4
Q.31

The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour

  • measures the elevation in boiling point.
  • is not dependent on the temperature.
  • is a function of the liquid phase composition.
  • measures the depression in freezing point.
Q.32

A solution is made by dissolving 1 kilo mole of solute inkg of solvent. The molality of the solution is

  • 2
  • 1
  • 0.5
  • 0.5
Q.33

Molar heat capacity of water in equilibrium with ice at constant pressure is

  • 0
  • ∞
  • 1
  • none of these
Q.34

Which of the following is not a colligative property ?

  • Osmotic pressure
  • Depression of freezing point
  • Lowering of vapor pressure
  • none of these.
Q.35

S.T.P. corresponds to

  • 1 atm. absolute pressure & 15.5°C.
  • 760 mm Hg gauge pressure & 15.5°C.
  • 760 torr & 0°C.
  • 101.325 kPa gauge pressure & 15.5°C.
Q.36

One Newton is equal to __________ dynes.

  • 102
  • 103
  • 104
  • 105
Q.37

One micron is equal to

  • 10-4 mm
  • 10-4 cm
  • 10-6 m
  • both(b)&(c)
Q.38

Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult's law is proportional to the

  • temperature.
  • volume of solution.
  • moles of non-volatile solute.
  • none of these.
Q.39

Average molecular weight of air is about

  • 21
  • 29
  • 23
  • 79
Q.40

6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be __________ gm.

  • 0.5
  • 1
  • 3
  • 5
Q.41

If pH value of a solution isthen its pOH value will be

  • 6
  • 1
  • 7
  • 10
Q.42

Atoms of the same element, but of different masses are called

  • isobars
  • isotones
  • isotopes
  • none of these
Q.43

With rise in pressure, the solubility of gases in solvent, at a fixed temperature

  • increases
  • decreases
  • remains unchanged
  • decreases linearly
Q.44

A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to

  • x1/x2
  • x2/x1
  • 1 - (x1/x2)
  • 1/x2
Q.45

An ideal gas can be liquified, because

  • its molecular size is very small.
  • its critical temperature is more than 0°C.
  • forces operative between its molecules are negligible.
  • it gets solidified directly without becoming liquid.
Q.46

Pick out the wrong statement.

  • The effect of pressure on heat capacity of gases at pressure above one atmosphere and above the critical temperature is negligible.
  • The value of Cp of gases increases with increase in pressure, above atmospheric pressure.
  • The value of Cp at critical temperature and pressure reaches infinity.
  • all (a), (b), and (c).
Q.47

1 kgf/cm2 is not equal to

  • 1 torr
  • 1 bar
  • 10000 mm wc
  • 100 KPa = 100 000 N/m2
Q.48

For a reacation, X → Y, if the concentration of 'X' is tripled; the rate becomes nine times. The order of reaction is

  • 0
  • 1
  • 2
  • 3
Q.49

The heat of adsorption of a gas caused by Van der Walls forces of attraction and capillarity is equal to the heat of

  • normal condensation.
  • wetting.
  • sum of (a) and (b).
  • difference of (a) and (b).
Q.50

pH value of an alkaline solution is

  • 7
  • > 7
  • < 7
  • constant over a wide range
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