Chemical Equilibrium| First Year Chemistry Past Paper MCQs | mosaicbro.com

Chemical Equilibrium| First Year Chemistry Past Paper MCQs

7 of 30 questions (Page 4 of 5)

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22 In a mixture of 7g of N₂ and 8g of O₂, the mole fraction of O₂ is:
Correct Answer: C
Explanation: Moles of N₂ = 7/28 = 0.25; O₂ = 8/32 = 0.25 ⇒ X_O₂ = 0.25/(0.25+0.25) = 0.5.
23 Cheese and butter are examples of solution of:
Correct Answer: C
Explanation: Emulsions (liquid fat in solid protein matrix).
24 A solution containing 5.3 g of Na₂CO₃ dissolved per dm³ is:
Correct Answer: D
Explanation: Molarity = (5.3/106) mol / 1 dm³ = 0.05 M (Na₂CO₃ MW = 106).
25 Water of crystallization of CuSO₄ is:
Correct Answer: A
Explanation: CuSO₄·5H₂O has 5 water molecules per formula unit.
26 If we dissolve Na₂SO₄ in water, then the solution is:
Correct Answer: C
Explanation: Na₂SO₄ is a neutral salt (strong base + strong acid).
27 Solution containing relatively lower concentrations of solutes are called:
Correct Answer: A
Explanation: Dilute solutions have low solute concentrations.
28 The critical solution temperature of phenol-water system is:
Correct Answer: D
Explanation: Phenol and water become completely miscible above 65.9°C.
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