Discussion
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- Question
What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20)?
Options- A. AB3
- B. A2B3
- C. A2B
- D. AB2
- Correct Answer
- AB3
- 1. Addition of a non-volatile solute to a pure solvent
Options- A. increases its freezing point.
- B. increases its boiling point.
- C. decreases its freezing point.
- D. both (b) and (c) Discuss
- 2. The vapour pressure of water is given by, in Psat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50°C is approximately
Options- A. 0.07
- B. 0.09
- C. 0.11
- D. 0.13 Discuss
- 3. For the gaseous phase reaction, N2 + O2⇌2NO, ?H = + 80 kJ/kg. mole; the decomposition of NO is favoured by
Options- A. increasing the concentration of N2.
- B. decrease in temperature.
- C. increase in pressure.
- D. decrease in pressure. Discuss
- 4. The quantity of heat required to evaporate 1 kg of a saturated liquid is called
Options- A. specific heat
- B. 1 Kcal
- C. sensible heat
- D. latent heat Discuss
- 5. How much O2 can be obtained from 90 kg of water?
Options- A. 32 kg
- B. 80 kg
- C. 64 kg
- D. 90 kg Discuss
- 6. Vapor pressure of a solution is proportional to(where, Sv and St are mole fraction of solvent and solute respectively).
Options- A. Sv
- B. 1/St
- C. St
- D. 1/Sv Discuss
- 7. A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is
Options- A. 380
- B. 630
- C. 760
- D. 880 Discuss
- 8. Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces?
Options- A. RT
- B.
- C. (V - b)
- D. 1/RT Discuss
- 9. Pick out the wrong statement:
Options- A. The integral heat of solution of either components can not be calculated from heat of mixing data.
- B. The average value of heat of neutralisation of dilute solutions of weak acids and bases is much less compared to that for strong acids and bases.
- C. The standard heat of solution of the hydrate of a substance is the difference between the heat of solution of the anhydrous substance and its heat of hydration.
- D. The accompanying enthalpy change, when a solute is dissolved in solvent, depends upon the nature & amount of the solute & the solvent, on the temperature & on the initial & final concentrations of the solution. Discuss
- 10. Pick out the wrong unit conversion.
Options- A. 1 atm. = 760 mm Hg = 29.92 inch Hg = 14.7 psi = 1.013 bar = 1.013 kgf/cm2
- B. 1 kPa = 100 bar
- C. 1 mm Hg = 1 torr = 133.3 Pa
- D. - Discuss
Stoichiometry problems
Search Results
Correct Answer: both (b) and (c)
Correct Answer: 0.13
Correct Answer: decrease in temperature.
Correct Answer: latent heat
Correct Answer: 80 kg
Correct Answer: Sv
Correct Answer: 630
Correct Answer: RT
Correct Answer: The integral heat of solution of either components can not be calculated from heat of mixing data.
Correct Answer: 1 kPa = 100 bar
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