Liquids and Solids | First Year Chemistry Past Paper MCQs | mosaicbro.com

Liquids and Solids | First Year Chemistry Past Paper MCQs

7 of 53 questions (Page 4 of 8)

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22 The boiling points of higher alkanes are greater than lower alkanes because:
Correct Answer: B
Explanation: Increased polarizability strengthens London dispersion forces in larger molecules.
23 Water has maximum density at:
Correct Answer: A
Explanation: Water density peaks at 4°C due to H-bonding and lattice expansion on freezing.
24 K₂SO₄ and K₂CrO₄ are isomorphic solids and exist in:
Correct Answer: B
Explanation: Both adopt orthorhombic crystal structures (isomorphism).
25 The transition temperature of KNO₃ is:
Correct Answer: C
Explanation: KNO₃ transitions from orthorhombic to trigonal at 128°C.
26 The distillation of liquid under reduced pressure is called:
Correct Answer: B
Explanation: Vacuum distillation lowers boiling points by reducing pressure.
27 The structure of sodium chloride is:
Correct Answer: B
Explanation: NaCl has a face-centered cubic (FCC) lattice.
28 The forces between ions and water molecules are known as:
Correct Answer: B
Explanation: Hydration involves ion-dipole interactions.
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