Stoichiometry

71. Addition of zircon to silica refractory brick improves its

  1. Crushing strength
  2. Resistance to slag attack
  3. Both (A) and (B)
  4. Neither (A) nor (B)

Correct answer: (B)
Resistance to slag attack

72. Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20°C is 17.5 mm Hg.

  1. 80.38
  2. 80
  3. 79.62
  4. 78.51

Correct answer: (C)
79.62

73. An aqueous solution of 2.45% by weight H2SO4 has a specific gravity of 1.011. The composition expressed in normality is

  1. 0.25
  2. 0.2528
  3. 0.5
  4. 0.5055

Correct answer: (D)
0.5055

74. An Azeotropic solution of two liquids has boiling point lower than either of them, when it

  1. Is saturated
  2. Is unsaturated
  3. Shows negative deviation from Raoult's law
  4. Shows positive deviation from Raoult's law

Correct answer: (D)
Shows positive deviation from Raoult's law

75. An equation for calculating vapour pressure is given by, log10 P = A - B(t + c). This is called the

  1. Kistyakowsky equation
  2. Antoine equation
  3. Kopp's rule
  4. Trouton's rule

Correct answer: (B)
Antoine equation

76. An ideal gas can be liquefied, because

  1. Its molecular size is very small
  2. Its critical temperature is more than 0°C
  3. Forces operative between its molecules are negligible
  4. It gets solidified directly without becoming liquid

Correct answer: (C)
Forces operative between its molecules are negligible

77. An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?

  1. Cork
  2. Saw dust
  3. Sand
  4. Chemically prepared foam

Correct answer: (C)
Sand

78. An oxidation process is accompanied by decrease in the

  1. Number of electrons
  2. Oxidation number
  3. Number of ions
  4. All (A), (B) & (C)

Correct answer: (A)
Number of electrons

79. Applicability of Clausius-Clapeyron Equation is subject to the condition that the

  1. Vapor follows ideal gas law
  2. Volume in the liquid state is negligible
  3. Both (A) & (B)
  4. Neither (A) nor (B)

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

80. As per Kirchhoff s equation, the heat of reaction is affected by the

  1. Pressure
  2. Volume
  3. Temperature
  4. Molecularity

Correct answer: (C)
Temperature

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