O Levels Chemistry (5070)•5070/12/O/N/18
Explanation
Solubility rules for metal salts
Steps:
- Carbonates are insoluble except for Group 1 metals like potassium.
- Chlorides are soluble except for silver, lead, and mercury(I).
- Sulfates are soluble except for barium, strontium, lead, and calcium.
- Only potassium has all three salts soluble.
Why C is correct:
- Potassium, a Group 1 metal, forms K2CO3, KCl, and K2SO4, all highly soluble per solubility rules for alkali metal compounds.
Why the others are wrong:
- A. Barium sulfate (BaSO4) is insoluble.
- B. Calcium carbonate (CaCO3) is insoluble.
- D. Silver chloride (AgCl) is insoluble.
Final answer: C
Topic: Group I properties
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