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MCQs

Total Questions : 1913 | Page 5 of 192 pages
Question 41. 1 gm mole of methane (CH₄) contains
  1.    6.02 x 1023 atoms of hydrogen
  2.    4 gm atoms of hydrogen
  3.    3.01 x 1023 molecules of methane
  4.    3 gms of carbon
 Discuss Question
Answer: Option B. -> 4 gm atoms of hydrogen
Question 42. Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is
  1.    1.72
  2.    0.58
  3.    0.5
  4.    0.2
 Discuss Question
Answer: Option B. -> 0.58
Question 43. N₂ content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60)
  1.    80%
  2.    90%
  3.    95%
  4.    98%
 Discuss Question
Answer: Option B. -> 90%
Question 44. __________ equation gives the effect of temperature on heat of reaction.
  1.    Kirchoffs
  2.    Maxwell's
  3.    Antonie
  4.    Kistyakowsky
 Discuss Question
Answer: Option A. -> Kirchoffs
Question 45. For the gaseous phase reaction, N₂ + O₂ ⇋ 2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by
  1.    Increasing the concentration of N₂
  2.    Decrease in temperature
  3.    Increase in pressure
  4.    Decrease in pressure
 Discuss Question
Answer: Option B. -> Decrease in temperature
Question 46. The most convenient way of expressing solution concentration is in terms of
  1.    Mole fraction
  2.    Normality
  3.    Molality
  4.    Molarity
 Discuss Question
Answer: Option D. -> Molarity
Question 47. For an ideal solution, the total vapor pressure varies __________ with the composition(expressed as mole fraction).
  1.    Inversely
  2.    Exponentially
  3.    Linearly
  4.    Negligibly
 Discuss Question
Answer: Option C. -> Linearly
Question 48. For a given mass of a gas at constant temperature, if the volume 'V' becomes three times, then the pressure 'P' will become
  1.    P/3
  2.    3P
  3.    9P²
  4.    9P
 Discuss Question
Answer: Option A. -> P/3
Question 49. Boiling point of a non-homogeneous mixture of immiscible liquids is __________ that of any one of its separate components.
  1.    Lower than
  2.    Higher than
  3.    Equal to
  4.    Either A or B; depends on the liquids
 Discuss Question
Answer: Option A. -> Lower than
Question 50. N.T.P. corresponds to
  1.    1 atm.absolute pressure& 0°C
  2.    760 mm Hg gauge pressure & 0°C
  3.    760 torr & 15°C
  4.    101.325 KPa gauge pressure & 0°C
 Discuss Question
Answer: Option A. -> 1 atm.absolute pressure& 0°C

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