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Question

Which of the following reaction produces a base?


A

Reaction between metal and oxygen

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B

Reaction between a metal oxide and water

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C

Reaction between an acid and a base

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D

Heating of metal carbonates

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Solution

The correct option is B

Reaction between a metal oxide and water


- Metal oxides react with water to form bases by associating with hydroxyl ion present in water. For example, the chemical reaction between calcium oxide and water:

CaO(s)+H2O(l)Ca(OH)2(aq)

- Basic oxides can be made by the direct combination of metals with oxygen.
- Heating of metal carbonates produces metal oxide and releases CO2 gas.

- Salt and water are formed when acid reacts with base.

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