161. Disappearance of snow in subzero weather exemplifies the process of
Evaporation
Sublimation
Vaporisation
Melting
✅ The correct answer is option B.
Statiometery MCQs
162. The elevation in boiling point of a solution is proportional to the __________ of the solution.
Molal concentration
Reciprocal of the molal concentration
Normality
Molarity
✅ The correct answer is option A.
163. The total volume occupied by a gaseous mixture is equal to the sum of the pure component volumes. This is the __________ law.
Dalton’s
Amgat’s
GayLussac’s
Avogadro’s
✅ The correct answer is option B.
164. One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m³. It cools to 98°C ; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m³. The amount of water vapour condensed (in kg) is
0
0.065
0.1
1
✅ The correct answer is option B.
165. Addition of a non-volatile solute to a solvent produces a __________ in its solvent.
Freezing point elevation
Boiling point depression
Vapor pressure lowering
All of the above
✅ The correct answer is option C.
166. A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the
Atomic weight of the metal is 4
Equivalent weight of the metal is 4
Atomic weight of the metal is 2
Equivalent weight of the metal is 8
✅ The correct answer is option B.
167. A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO₂, 0.05 gm mole of oxygen and 0.80 gm mole of N₂. What is its molecular weight?
28.6
30
30.6
32.6
✅ The correct answer is option C.
168. On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes
1
8
4
2
✅ The correct answer is option C.
169. Gases diffuse faster compared to liquids because of the reason that the liquid molecules
Are held together by stronger inter-molecular forces
Move faster
Have no definite shape
Are heavier
✅ The correct answer is option A.
170. Which of the following gases is the most soluble in water?
NH₃
CO₂
H₂S
CH₄
✅ The correct answer is option A.