Stoichiometry

141. For water evaporating into unsaturated air under adiabatic conditions and at constant pressure, the _________ remains constant throughout the period of vaporisation.

  1. Dry bulb temperature
  2. Wet bulb temperature
  3. Humidity
  4. Relative saturation

Correct answer: (B)
Wet bulb temperature

142. Fusion point of a basic refractory material is

  1. Reduced by the addition of acid oxides
  2. Increased by the addition of acid oxides
  3. Not affected by the addition of acid oxides
  4. Always less than 1000°C

Correct answer: (A)
Reduced by the addition of acid oxides

143. Gases diffuse faster compared to liquids because of the reason that the liquid molecules

  1. Are held together by stronger inter-molecular forces
  2. Move faster
  3. Have no definite shape
  4. Are heavier

Correct answer: (A)
Are held together by stronger inter-molecular forces

144. Gases having same reduced temperatures and reduced pressures

  1. Deviate from ideal gas behaviour to the same degree
  2. Have nearly the same compressibility factor
  3. Both (A) and (B)
  4. Neither (A) nor (B)

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

145. Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is

  1. 10.73 kJ
  2. 16.15 kJ
  3. 18.11 kJ
  4. 18.33 kJ

Correct answer: (C)
18.11 kJ

146. Heat of _________ of a fuel is called its calorific value.

  1. Formation
  2. Combustion
  3. Reaction
  4. Vaporisation

Correct answer: (B)
Combustion

147. Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because

  1. The strong base and strong acid reacts completely
  2. The salt formed does not hydrolyse
  3. Only OH- and H+ ions react in every case
  4. The strong base and strong acid reacts in aqueous solution

Correct answer: (C)
Only OH- and H+ ions react in every case

148. Heat of neutralisation of HCl and NaOH is - 57.46 kJ/Kg mole. The heat of ionisation of water will be _________ kJ/Kg mole.

  1. 57.46
  2. -57.46
  3. 114.92
  4. -28.73

Correct answer: (A)
57.46

149. Heat of reaction is a function of the

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

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

150. Heat of reaction is not influenced by

  1. The route/method through which final products are obtained
  2. The physical state (e.g., solid, liquid or gaseous) of reactants and products
  3. Whether the reaction is carried out at constant temperature or constant pressure
  4. None of these

Correct answer: (A)
The route/method through which final products are obtained

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