Arrange the following in increasing order of their melting points.
- \(H_2O\)
- \(CCl_4\)
- \(SiO_2\)
- \(Mg\)
- \(NaCl\)
Choose the correct answer from the options given below
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → B < A < D < E < C
The melting point of a solid depends on the type of particles and the forces between them.
B. CCl4 — a non-polar molecular solid; only weak dispersion forces, melting point 250 K, the lowest.
A. H2O — a hydrogen-bonded molecular solid (ice); melting point 273 K.
D. Mg — a metallic solid; metallic bonding, melting point about 923 K.
E. NaCl — an ionic solid; strong electrostatic forces, melting point about 1074 K.
C. SiO2 — a covalent network solid; strong covalent bonds throughout the crystal, melting point about 1986 K, the highest.
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Classification of Crystalline Solids – …
