Stoichiometry

171. In a chemical process, the recycle stream is purged for

  1. Increasing the product yield
  2. Enriching the product
  3. Limiting the inerts
  4. Heat conservation

Correct answer: (C)
Limiting the inerts

172. 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

  1. 180
  2. 60.3
  3. 720
  4. 200

Correct answer: (B)
60.3

173. In a neutral solution

  1. H+ ions are absent
  2. OH- ions are absent
  3. Both H+ and OH- ions are present in very small but equal concentration
  4. None of these

Correct answer: (C)
Both H+ and OH- ions are present in very small but equal concentration

174. In case of a ternary system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the

  1. Solute concentration
  2. Temperature
  3. Both (A) & (B)
  4. Neither (A) nor (B)

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

175. In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the

  1. Total pressure
  2. Absolute humidity at a given temperature
  3. Both (A) and (B)
  4. Neither (A) nor (B)

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

176. In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?

  1. Use of equation of state
  2. Fugacity co-efficient
  3. Activity co-efficient
  4. None of these

Correct answer: (C)
Activity co-efficient

177. In general, the specific heats of aqueous solutions _________ with increase in the concentration of the solute.

  1. Increase
  2. Decrease
  3. Remain unchanged
  4. None of these

Correct answer: (B)
Decrease

178. In osmosis through a semi-permeable membrane, diffusion of the

  1. Solvent is from low concentration to high concentration region
  2. Solvent is from high concentration to low concentration region
  3. Solute takes place
  4. None of these

Correct answer: (A)
Solvent is from low concentration to high concentration region

179. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at _________ °C for 24 hours.

  1. 700
  2. 1000
  3. 1600
  4. 2000

Correct answer: (C)
1600

180. In physical adsorption, as compared to chemisorption, the

  1. Quantity adsorbed per unit mass is higher
  2. Rate of adsorption is controlled by the resistance to surface reaction
  3. Activation energy is very high
  4. Heat of adsorption is very large

Correct answer: (A)
Quantity adsorbed per unit mass is higher

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