Stoichiometry Conceptual Questions - Set 23 - ObjectiveBooks

# Practice Test: Question Set - 23

1. What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20)?
(A) AB3
(B) A2B3
(C) A2B
(D) AB2

2. In a chemical process, the recycle stream is purged for
(A) Increasing the product yield
(B) Enriching the product
(C) Limiting the inerts
(D) Heat conservation

3. How much O2 can be obtained from 90 kg of water?
(A) 32 kg
(B) 80 kg
(C) 64 kg
(D) 90 kg

4. pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be
(A) 0
(B) 10
(C) 7
(D) 14

5. Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is
(A) 1.72
(B) 0.58
(C) 0.5
(D) 0.2

6. The heat of solution depends upon the
(A) Nature of solvent
(B) Concentration of solution
(C) Nature of solute
(D) All (a), (b) & (c)

7. One 'Therm' is equivalent to
(A) 105 BTU
(B) 105 kcal
(C) 109 BTU
(D) 109 kcal

8. Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of
(A) Mixing
(C) Wetting
(D) Complete wetting

9. The value of (Cp - Cv) for a real gas obeying Vander Wall's equation is
(A) R
(B) > R
(C) < R
(D) 0.5 R

10. Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the
(A) Nature of the liquid
(B) Nature of the gas
(C) Temperature of the liquid
(D) Total pressure

11. In ________ process, ions of salts react with water to produce acidity or alkalinity.
(A) Hydration
(B) Hydrolysis
(C) Electrolysis
(D) Dialysis

12. If a solution of eutectic composition is cooled, ________ reaching the eutectic temperature?
(A) The solvent begins to freeze out even before
(B) It will undergo no change until
(C) It will not solidify even on
(D) None of these

13. For the gaseous phase reaction, N2 + O2 2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favored by
(A) Increasing the concentration of N2
(B) Decrease in temperature
(C) Increase in pressure
(D) Decrease in pressure

14. The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be ________ times.
(A) 1/2
(B) 4
(C) √2
(D) 1/4

15. 1 Kcal/kg. °C is equivalent to ________ BTU/lb. °F.
(A) 1
(B) 2.42
(C) 4.97
(D) None of these

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