Stoichiometry problems
- 1. 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
Correct Answer: 106
- 2. 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
Correct Answer: lower than
- 3. 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
Correct Answer: superheated
- 4. '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
Correct Answer: temperature vs. log (vapor pressure).
- 5. 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
Correct Answer: 54
- 6. One of the specific gravity scales is "Brix" (used speicifically for sugar solution). It is defined as
Options- A. Brix = (400/G) - 400
- B. Brix = 200 (G-1)
- C. Brix = 145 - (145/G)
- D. none of these Discuss
Correct Answer: Brix = (400/G) - 400
- 7. The maximum adiabatic flame temperature of fuels in air is __________ the maximum flame temperature in pure oxygen.
Options- A. lower than
- B. higher than
- C. same as
- D. not related to Discuss
Correct Answer: lower than
- 8. Pick out the wrong statement.
Options- A. Ten times dilution of a normal solution (N) reduces its normality to N/10.
- B. When equal weights of oxygen and methane are mixed in an empty reactor at room temperature, then the fraction of total pressure exerted by the oxygen is 1/2.
- C. Volume occupied by 9.034 x 1023 atoms of oxygen in ozone (O3) at NTP will be 11200 c.c
- D. One kg mole of an ideal gas at N.T.P occupies 22400 Nm3. Discuss
Correct Answer: One kg mole of an ideal gas at N.T.P occupies 22400 Nm3.
- 9. The density of a gas at N.T.P.is '?'. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become
at a temperature of __________ °K
Options- A. 273°
- B. 300°
- C. 400°
- D. 300° Discuss
Correct Answer: 400°
- 10. Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the
Options- A. sizes of the component molecules are approximately equal.
- B. attractive forces between like and unlike molecules are approximately equal.
- C. component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution.
- D. all (a), (b) & (c). Discuss
Correct Answer: all (a), (b) & (c).
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