| (i) Solubility in water\[LiOH<NaOH<KOH<RbOH<CsOH\] |
| (ii) Thermal stability\[BeS{{O}_{4}}<MgS{{O}_{4}}<CaS{{O}_{4}}<SrS{{O}_{4}}<BaS{{O}_{4}}\] |
| (iii) Melting point \[NaCl>KCl>RbCl>CsCl>LiCl\] |
| (iv) Solubility in water \[L{{i}_{2}}C{{O}_{3}}<N{{a}_{2}}C{{O}_{3}}<{{K}_{2}}C{{O}_{3}}<R{{b}_{2}}C{{O}_{3}}\] |
A) I, II and III
B) I, II and IV
C) II, III and IV
D) All of these
Correct Answer: D
Solution :
| (i) Solubility of hydroxides of alkali metals increases with increase in the size of alkali metal ion. |
| (ii) Thermal stability of alkaline earth metal sulphate increases on moving downwards due to their similar lattice energy and decrease in hydration energy. |
| (iii) Melting point \[=5\times {{10}^{-3}}\times 100=0.5\,\,V\] ionic character. |
| (iv) Solubility of carbonates of alkali metal increases on moving downwards. |
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