Which of the following method is not used in preparation of a base?

Burning metal in air

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Adding water to a metal oxide

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Reaction between an acid and base

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Heating metal carbonates

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Solution

The correct option is B Reaction between an acid and base
A. When any metal burns in air it is quite reactive and the reactivity is a function of the relative humidity or water vapour content of the air. In ordinary air metal reacts to form metal hydroxide film which is basic in nature.
$N a + a i r \to N a O H$
B. Alkaline solutions are made when soluble metal oxides dissolve in water. Basic oxides are the oxides of metals.
$N a O + w a t e r \to N a O H$
C. Acid and base reacts to form salt and water.
$H C l + N a O H \to N a C l + w a t e r$
D. Metal carbonates when heated break down to form metal oxide,carbon dioxide and water. ${N a}_{2} {C O}_{3} △ - \to N a O + {C O}_{2} + H_{2} O$

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