Chemistry - PERIODIC TABLE Question with Solution | TestHub
Answer the following by appropriately matching the lists based on the information given in the paragraph
List - I | List - II |
|---|---|
(I) Perchlorates of Alkali metals | (P) Melting point |
(II) Chlorides of Alkali metals | (Q) Lattice energy |
(III) Fluorides of Alkaline earth metals | (R) Thermal stability |
(IV) Hydroxides of Alkaline earth metals | (S) Solubility in |
| (T) Covalent character |
| (U) Ionic character |
Which of the following is an INCORRECT match?
Options:
Answer:
Solution:
For alkali metal chlorides (II), the melting point (P) does not follow a simple periodic trend. For instance, LiCl has a lower melting point than NaCl due to its high covalent character (Fajans' rule).
In contrast, thermal stability (R) for polyatomic ions like perchlorates (I) and hydroxides (IV) increases consistently down the group as the larger cation stabilizes the larger anion.
Since the properties listed in (B) do not follow a consistent trend for alkali chlorides, it is the incorrect match.