Stoichiometry

51. A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the

  1. Atomic weight of the metal is 4
  2. Equivalent weight of the metal is 4
  3. Atomic weight of the metal is 2
  4. Equivalent weight of the metal is 8

Correct answer: (B)
Equivalent weight of the metal is 4

52. A perfectly insulated container of volume V is divided into two equal halves by a partition. One side is under vacuum, while the other side has one mole of an ideal gas (with constant heat capacity) at 298 K. If the partition is broken, the final temperature of the gas in the container

  1. Will be greater than 298 K
  2. Will be 298 K
  3. Will be less than 298 K
  4. Cannot be determined

Correct answer: (C)
Will be less than 298 K

53. A reduction process is accompanied with increase in the

  1. Number of electrons
  2. Oxidation number
  3. Both (A) & (B)
  4. Neither (A) nor (B)

Correct answer: (A)
Number of electrons

54. A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is

  1. 13728 J
  2. 19206 J
  3. 4576 J
  4. 12712 J

Correct answer: (B)
19206 J

55. 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

Correct answer: (A)
350

56. A saturated vapor on being compressed would

  1. Condense
  2. Form wet steam
  3. Both (A) & (B)
  4. Neither (A) nor (B)

Correct answer: (C)
Both (A) & (B)

57. A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of

  1. 3
  2. 100
  3. 1000
  4. None of these

Correct answer: (C)
1000

58. A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is

  1. 2
  2. 1
  3. 0.5
  4. 0.05

Correct answer: (C)
0.5

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

  1. Ideal
  2. Non-ideal
  3. Buffer
  4. Colloidal

Correct answer: (C)
Buffer

60. A sugar solution containing _________ percent sugar is equivalent to 1 Brix.

  1. 0.01
  2. 0.1
  3. 1
  4. 10

Correct answer: (C)
1

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