Stoichiometry Mcqs for Chemical - Set 6

1)   Molality is defined as the number of gm moles of solute per _____________ of solvent?

a. Litre
b. kg
c. gm.mole
d. gm
Answer  Explanation 

ANSWER: kg

Explanation:
No explanation is available for this question!


2)   Weight of 56 litres of ammonia at N.T.P. is _____________ gm?

a. 2.5
b. 42.5
c. 56
d. 2800
Answer  Explanation 

ANSWER: 42.5

Explanation:
No explanation is available for this question!


3)   Which of the following is the Clausius-Clapeyron Equation ?

a. PV = RT + B/V + y/V2 + ….
b. (P + a/V2)(V-b) = RT
c. loge (p/p0) = (λ/R) (1/T0 – 1/T)
d. p = [RT/(V – b)] – (a/TV2)
Answer  Explanation 

ANSWER: loge (p/p0) = (λ/R) (1/T0 – 1/T)

Explanation:
No explanation is available for this question!


4)   The value of Trouton’s ratio (λb/Tb) for a number of substances is 21 (where, λb = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, °K). The Kistyakowsky equation is used for calculation of Trouton’s ratio of _____________ liquids?

a. Polar
b. Non-polar
c. Both A. & B.
d. Neither A. nor B.
Answer  Explanation 

ANSWER: Both A. & B.

Explanation:
No explanation is available for this question!


5)   The reverse process of fractional crystallisation is called__________________?

a. Stripping
b. Leaching
c. Differential distillation
d. Absorption
Answer  Explanation 

ANSWER: Leaching

Explanation:
No explanation is available for this question!


6)   Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3. The diffusivity of aniline in air is 0.74 × 10-5m2/s. The numerical value of mass transfer co-efficient is 7.4 × 10-3. Its units are_______________________?

a. m/s
b. cm/s
c. mole/m2.s.Pa
d. k.mole/m2.s.Pa
Answer  Explanation 

ANSWER: mole/m2.s.Pa

Explanation:
No explanation is available for this question!


7)   Pick out the wrong unit conversion of thermal conductivity ?

a. 1 BTU/ft2.hr.°F/ft = 1.488 kcal/m2. hr.°C/m
b. 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m
c. 1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K
d. 1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F
Answer  Explanation 

ANSWER: 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m

Explanation:
No explanation is available for this question!


8)   For any system, the _____________ heat of solution is dependent on the temperature and the adsorbate concentration?

a. Integral
b. Differential
c. Both A. & B.
d. Neither A. nor B.
Answer  Explanation 

ANSWER: Both A. & B.

Explanation:
No explanation is available for this question!


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

a. °Be = (140/G) – 130
b. °Be = 200(G-1)
c. °Be = 145 – (145/G)
d. °Be = (400/G) – 400
Answer  Explanation 

ANSWER: °Be = (140/G) – 130

Explanation:
No explanation is available for this question!


10)   Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the________________?

a. Vapor follows the ideal gas law
b. Molal latent heat of vaporisation is constant within the limited temperature range
c. Volume in the liquid state is negligible compared with that in the vapor state
d. All A., B. & C.
Answer  Explanation 

ANSWER: All A., B. & C.

Explanation:
No explanation is available for this question!


11)   1 gm mole of an alcohol whose molecular weight is 74 contains 48 gms of carbon, 10 gms of hydrogen and 16 gms of oxygen. Its molecular formula is__________________?

a. C4H9OH
b. C3H21OH
c. (C2H4)2H2.OH
d. C2H33OH
Answer  Explanation 

ANSWER: C4H9OH

Explanation:
No explanation is available for this question!


12)   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________________?

a. Sizes of the component molecules are approximately equal
b. Attractive forces between like and unlike molecules are approximately equal
c. Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the so
d. All A., B. & C.
Answer  Explanation 

ANSWER: All A., B. & C.

Explanation:
No explanation is available for this question!


13)   The increase in the temperature of the aqueous solution will result in decrease of its________________?

a. Weight % of the solute
b. Mole fraction of the solute
c. Molarity
d. Molality
Answer  Explanation 

ANSWER: Molarity

Explanation:
No explanation is available for this question!


14)   The vapor pressure of a substance, at its melting point, is _____________ in the solid state as compared to that in the liquid state?

a. Less
b. More
c. Same
d. Either A. or B.; depends on the nature of the substance
Answer  Explanation 

ANSWER: Same

Explanation:
No explanation is available for this question!


15)   In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality ?

a. Use of equation of state
b. Fugacity co-efficient
c. Activity co-efficient
d. None of these
Answer  Explanation 

ANSWER: Activity co-efficient

Explanation:
No explanation is available for this question!


16)   Which of the following ideal gas laws are not applicable to mixture of gases ?

a. Amagat’s law
b. Dalton’s law
c. Boyle’s law & Charle’s Law
d. None of these
Answer  Explanation 

ANSWER: Boyle’s law & Charle’s Law

Explanation:
No explanation is available for this question!


17)   Solutions having the same osmotic pressure are called _____________ solutions?

a. Dilute
b. Ideal
c. Isotonic
d. Saturated
Answer  Explanation 

ANSWER: Isotonic

Explanation:
No explanation is available for this question!


18)   The molecular velocity of a real gas is proportional to (where, T = absolute temperature of the gas)?

a. √T
b. T
c. T2
d. 1/√T
Answer  Explanation 

ANSWER: √T

Explanation:
No explanation is available for this question!


19)   Which of the following gases is the most soluble in water ?

a. NH3
b. CO2
c. H2S
d. CH4
Answer  Explanation 

ANSWER: NH3

Explanation:
No explanation is available for this question!


20)   A reduction process is accompanied with increase in the_______________?

a. Number of electrons
b. Oxidation number
c. Both A. & B.
d. Neither A. nor B.
Answer  Explanation 

ANSWER: Number of electrons

Explanation:
No explanation is available for this question!