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MCQs

Total Questions : 1913 | Page 14 of 192 pages
Question 131. Molar heat capacity of water in equilibrium with ice at constant pressure is
  1.    0
  2.    ∞
  3.    1
  4.    None of these
 Discuss Question
Answer: Option B. -> ∞
Question 132. The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies
  1.    XM < 0.5
  2.    XM = 0.5
  3.    0.5 < XM < 0.64
  4.    XM ≥ 0.64
 Discuss Question
Answer: Option D. -> XM ≥ 0.64
Question 133. The pressure under which liquid and vapor can co-exit at equilibrium is called the __________ vapor pressure.
  1.    Limiting
  2.    Real
  3.    Saturated
  4.    Normal
 Discuss Question
Answer: Option C. -> Saturated
Question 134. A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is
  1.    N₂O₄
  2.    N₂O₅
  3.    N₂O₃
  4.    None of these
 Discuss Question
Answer: Option B. -> N₂O₅
Question 135. The molar composition of a gas is 10% H₂, 10% O₂, 30% CO₂ and balance H₂O. If 50% H₂O condenses, the final mole percent of H₂ in the gas on a dry basis will be
be
  1.    10%
  2.    5%
  3.    18.18%
  4.    20%
 Discuss Question
Answer: Option D. -> 20%
Question 136. A gaseous mixture contains 14 kg of N₂, 16 kg of O₂ and 17 kg of NH₃. The mole fraction of oxygen is
  1.    0.16
  2.    0.33
  3.    0.66
  4.    0.47
 Discuss Question
Answer: Option B. -> 0.33
Question 137. On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes
  1.    1
  2.    8
  3.    4
  4.    2
 Discuss Question
Answer: Option C. -> 4
Question 138. An aqueous solution of 2.45% by weight H₂SO₄ has a specific gravity of 1.011. The composition expressed in normality is
  1.    0.2500
  2.    0.2528
  3.    0.5000
  4.    0.5055
 Discuss Question
Answer: Option D. -> 0.5055
Question 139. At room temperature, the product [H⁺] [OH⁻] in a solution is 10⁻¹⁴ moles/litre. If, [OH⁻] = 10⁻⁶ moles/litre, then the pH of the solution will be
  1.    6
  2.    8
  3.    10
  4.    12
 Discuss Question
Answer: Option B. -> 8
Question 140. A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)
  1.    350
  2.    485
  3.    140
  4.    345
 Discuss Question
Answer: Option A. -> 350

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