Stoichiometry Mcqs for Chemical - Set 17

1)   For the gaseous phase reaction, N2 + O2 ⇌ 2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by____________________?

a. Increasing the concentration of N2
b. Decrease in temperature
c. Increase in pressure
d. Decrease in pressure
Answer  Explanation 

ANSWER: Decrease in temperature

Explanation:
No explanation is available for this question!


2)   1 Kcal/kg. °C is equivalent to _______________ BTU/lb. °F ?

a. 1
b. 2.42
c. 4.97
d. None of these
Answer  Explanation 

ANSWER: 1

Explanation:
No explanation is available for this question!


3)   A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO2, 0.05 gm mole of oxygen and 0.80 gm mole of N2. What is its molecular weight ?

a. 28.6
b. 30.0
c. 30.6
d. 32.6
Answer  Explanation 

ANSWER: 30.6

Explanation:
No explanation is available for this question!


4)   A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be________________?

a. 0°C
b. 0°K
c. -136.5°C
d. -136.5°K
Answer  Explanation 

ANSWER: -136.5°C

Explanation:
No explanation is available for this question!


5)   500 c.c. each of hydrogen at 700 mm Hg pressure and oxygen at 600 mm Hg pressure are put together in a vessel of 1 litre capacity. The final pressure of the gas mixture will be _____________ mm Hg?

a. 650
b. 700
c. 600
d. 375
Answer  Explanation 

ANSWER: 650

Explanation:
No explanation is available for this question!


6)   A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is__________________?

a. 380
b. 630
c. 760
d. 880
Answer  Explanation 

ANSWER: 630

Explanation:
No explanation is available for this question!


7)   Sodium ______________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature?

a. Carbonate (monohydrate)
b. Chloride
c. Thiosulphate
d. Bisulphite
Answer  Explanation 

ANSWER: Carbonate (monohydrate)

Explanation:
No explanation is available for this question!


8)   The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is _____________ kg mole?

a. 1
b. 0
c. 16
d. 44
Answer  Explanation 

ANSWER: 0

Explanation:
No explanation is available for this question!


9)   According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________?

a. T
b. T0.5
c. T1.5
d. T2
Answer  Explanation 

ANSWER: T0.5

Explanation:
No explanation is available for this question!


10)   Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ?

a. Temperature
b. Nature of solute
c. Pressure
d. Nature of solvent
Answer  Explanation 

ANSWER: Pressure

Explanation:
No explanation is available for this question!


11)   Volume occupied by one gm mole of a gas at S.T.P. is ____________________?

a. 22.4 litres
b. 22400 litres
c. 22.4 c.c
d. 359 litres
Answer  Explanation 

ANSWER: 22.4 litres

Explanation:
No explanation is available for this question!


12)   In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is__________________?

a. 180
b. 60.3
c. 720
d. 200
Answer  Explanation 

ANSWER: 60.3

Explanation:
No explanation is available for this question!


13)   The vapour pressure of water is given by, in Psat = A – (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50°C is approximately__________________?

a. 0.07
b. 0.09
c. 0.11
d. 0.13
Answer  Explanation 

ANSWER: 0.13

Explanation:
No explanation is available for this question!


14)   Disappearance of snow in subzero weather exemplifies the process of_________________?

a. Evaporation
b. Sublimation
c. Vaporisation
d. Melting
Answer  Explanation 

ANSWER: Sublimation

Explanation:
No explanation is available for this question!


15)   The most convenient way of expressing solution concentration is in terms of___________________?

a. Mole fraction
b. Normality
c. Molality
d. Molarity
Answer  Explanation 

ANSWER: Molarity

Explanation:
No explanation is available for this question!


16)   Elements in a periodic table are arranged in order of their__________________?

a. Atomic number
b. Mass number
c. Atomic weight
d. Metallic characteristics
Answer  Explanation 

ANSWER: Atomic number

Explanation:
No explanation is available for this question!


17)   Unit of mass velocity is___________________?

a. kg/m.hr
b. kg/m2.h
c. kg/hr
d. kg/m2
Answer  Explanation 

ANSWER: kg/m2.h

Explanation:
No explanation is available for this question!


18)   In a binary liquid system, the composition expressed as _______________ is independent of the temperature & pressure?

a. Kg of solute/kg of solvent
b. Kg-mole of solute/kg-mole of solvent
c. Kg-mole of solute/1000 kg of solvent
d. All A., B. & C.
Answer  Explanation 

ANSWER: All A., B. & C.

Explanation:
No explanation is available for this question!


19)   The value of gas constant ‘R’ is ______________ kcal/kg.mole.°C?

a. 2.79
b. 1.987
c. 3.99
d. None of these
Answer  Explanation 

ANSWER: None of these

Explanation:
No explanation is available for this question!


20)   Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ?

a. Sv
b. 1/St
c. St
d. 1/Sv
Answer  Explanation 

ANSWER: Sv

Explanation:
No explanation is available for this question!