Stoichiometry Multiple Choice Test - Set 18 - ObjectiveBooks

# Practice Test: Question Set - 18

1. Atomic ________ of an element is a whole number.
(A) Weight
(B) Number
(C) Volume

2. Isotonic solutions must have the same
(A) Viscosity
(B) Molar concentration
(C) Normality
(D) Critical temperature

3. A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to
(A) x1/x2
(B) x2/x1
(C) 1 - (x1/x2)
(D) 1/x2

4. Internal energy of a substance comprises of the ________ energy.
(A) Vibrational
(B) Rotational
(C) Translational
(D) All (a), (b) & (c)

5. Pick out the wrong statement.
(A) Raoult's law holds good for the solubility of polar gases in non-polar liquids
(B) Molecules with symmetrical arrangement (e.g., CH4 and CCl4) are non-polar
(C) Most of the hydrocarbons are non-polar
(D) Generally, non-polar compounds are chemically inactive, conduct electricity poorly and do not ionise

6. Specific gravity on API scale is given by the relation (where, G = specific gravity at 15.5°C).
(A) °API = 200(G - 1)
(B) °API = (141.5/G) - 131.5
(C) °API = (140/G) - 130
(D) °API = 145 - (145/G)

7. Vapor pressure of water at 100°C is about ________ bar.
(A) 0.1013
(B) 1.013
(C) 10.13
(D) 101.3

8. A vapor whose partial pressure is less than its equilibrium vapor pressure is called the ________ vapor.
(A) Saturated
(B) Superheated
(C) Unsaturated
(D) Dry gaseous

9. With increase in temperature, the surface tension of water
(A) Increases
(B) Decreases
(C) Remain constant
(D) Increases linearly

10. An Azeotropic solution of two liquids has boiling point lower than either of them, when it
(A) Is saturated
(B) Is unsaturated
(C) Shows negative deviation from Raoult's law
(D) Shows positive deviation from Raoult's law

11. An ideal gas can be liquefied, because
(A) Its molecular size is very small
(B) Its critical temperature is more than 0°C
(C) Forces operative between its molecules are negligible
(D) It gets solidified directly without becoming liquid

12. For an ideal gas, the compressibility factor
(A) Decreases with pressure rise
(B) Is unity at all temperature
(C) Is unity at Boyle's temperature
(D) Zero

13. What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C?
(A) 2/3
(B) 1/3
(C) 1/2
(D) 1/3 × (298/273)

14. Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is
(A) 80.1°C
(B) Less than 80.1°C
(C) 100°C
(D) Greater than 80.1°C but less than 100°C

15. Average molecular weight of air is about
(A) 21
(B) 29
(C) 23
(D) 79

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