Which of the following are the examples of bases?

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potassium oxide

sodium hydroxide

All the above

calcium carbonate

answer is D.

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Detailed Solution

The sodium hydroxide, calcium carbonate and potassium oxide are examples of bases. A base is a substance that reacts with hydrogen ions and can neutralize the acid. Most bases are minerals which form water and salts by reacting with acids. Bases include the metal oxides, hydroxides, and carbonates.

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