Which one of the following carbonate is water insoluble ?
Correct answer: D. CaCO3
- A. Na2CO3
- B. K2CO3
- C. (NH4)2CO3
- D. CaCO3
Explanation
Most carbonates are insoluble in water, except those of Group I metals and ammonium. Calcium carbonate therefore remains as an insoluble solid, whereas sodium, potassium and ammonium carbonates dissolve. Students may choose sodium carbonate by overlooking the general solubility rule for alkali-metal carbonates.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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