. Which one of the following oxide is insoluble in water?
1. Na2O
2. CuO
3. K2O
4. CaO
Best Answer
Ans: 2
Sol: CuO (it do not form alkali)
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1. Na2O
2. CuO
3. K2O
4. CaO
Ans: 2
Sol: CuO (it do not form alkali)