Which of the following compounds is SOLUBLE?Group of answer choicescalcium carbonatepotassium carbonateBarium  carbonatecopper carbonatenone of the above

To determine which of the given compounds is soluble, we need to refer to the solubility rules for ionic compounds in water. Here are the steps:

1. Identify the compounds:

   • Calcium carbonate (CaCO₃)
   • Potassium carbonate (K₂CO₃)
   • Barium carbonate (BaCO₃)
   • Copper carbonate (CuCO₃)

2. Apply the solubility rules:

   • Carbonates (CO₃²⁻) are generally insoluble in water, with exceptions for those containing alkali metals (such as sodium, potassium) and ammonium (NH₄⁺).

3. Check each compound against the rules:

   • Calcium carbonate (CaCO₃): Generally insoluble.
   • Potassium carbonate (K₂CO₃): Potassium is an alkali metal, so potassium carbonate is soluble.
   • Barium carbonate (BaCO₃): Generally insoluble.
   • Copper carbonate (CuCO₃): Generally insoluble.

4. Conclusion:

   • The compound that is soluble is potassium carbonate (K₂CO₃).

Therefore, the correct answer is:

• Potassium carbonate