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- Question
The OH- concentration in a solution having pH value 3 is
Options- A. 10-3
- B. 10-10
- C. 10-11
- D. 10-13
- Correct Answer
- 10-11
- 1. For water evaporating into usaturated air under adiabatic conditions and at constant pressure, the __________ remains constant throughout the period of vaporisation.
Options- A. dry bulb temperature
- B. wet bulb temperature
- C. humidity
- D. relative saturation Discuss
- 2. At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to
Options- A. decrease in mean free path.
- B. increased collision rate among molecules.
- C. increase in molecular attraction.
- D. increase in average molecular speed. Discuss
- 3. In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is
Options- A. independent of the temperature.
- B. increased with the increase in pressure.
- C. decreased with the increase in pressure.
- D. unchanged by the pressure change.
- E. none of these Discuss
- 4. Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the
Options- A. recycling
- B. purging
- C. bypassing
- D. recirculation Discuss
- 5. °API gravity of water at N.T.P. is about
Options- A. 0
- B. 1
- C. 10
- D. 100 Discuss
- 6. In the reaction, represented by Na2CO3 + HC1 ? NaHO3 + NaCl, the equivalent weight of Na2CO3 is
Options- A. 53
- B. 5.3
- C. 106
- D. 10.6 Discuss
- 7. Boiling point of a non-homogeneous mixture of immiscible liquids is __________ that of any one of its separate components.
Options- A. lower than
- B. higher than
- C. equal to
- D. either (a) or (b); depends on the liquids Discuss
- 8. A vapor whose partial pressure is less than its equilibrium vapor pressure is called a __________ vapor.
Options- A. saturated
- B. supersaturated
- C. superheated
- D. none of these Discuss
- 9. 'Cox' chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the
Options- A. temperature vs. log (vapor pressure).
- B. vapor pressure vs. log (temperature).
- C. log (temperature) vs. log (vapor pressure).
- D. vapor pressure vs. temperature. Discuss
- 10. If 1.5 moles of oxygen combines with aluminium to form Al2O3, then the weight of aluminium (atomic weight = 27 ) used in this reaction is __________ gm.
Options- A. 27
- B. 54
- C. 5.4
- D. 2.7 Discuss
Stoichiometry problems
Search Results
Correct Answer: wet bulb temperature
Correct Answer: increase in molecular attraction.
Correct Answer: decreased with the increase in pressure.
Correct Answer: purging
Correct Answer: 10
Correct Answer: 106
Correct Answer: lower than
Correct Answer: superheated
Correct Answer: temperature vs. log (vapor pressure).
Correct Answer: 54
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