Which of the following method is used in the preparation of a base?

Burning of 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
Adding water to a metal oxide.

When basic oxides react with water, they form bases by getting associated with the hydroxyl ion present in water. Basic oxides can be formed by direct combination of metals with oxygen. For e.g.,
$C a O + H_{2} O \to C a (O H)_{2}$

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Similar questions

Assertion: Metal oxides are basic in nature.

Reason: Metal oxides neutralise the effect of acids and release water, similar to the reaction of a base with an acid.

Q. Statement 1: Metal oxides are also called basic oxides.
Statement 2: Metal oxides neutralize the effect of acids and release water, similar to the reaction of a base with an acid.

Since the products of reactions of acid + base and acid + metal oxide are same. Why acid + metal oxide reaction is not neutralization reaction?

Q. A salt can be produced by the reaction between:
A. a weak acid and weak base
B. metal oxide and water
C. metal and a mineral acid
D. metal oxide and a mineral acid

Question 24.
Which of the following statements is not correct ?

(a) All metal carbonates react with acid to give a salt, water and carbon dioxide
(b) All metal oxides react with water to give salt and acid
(c) Some metals react with acids to give salt and hydrogen
(d) Some non-metal oxides react with water to form an acid

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Which of the following method is used in the preparation of a base?

The correct option is B Adding water to a metal oxide. When basic oxides react with water, they form bases by getting associated with the hydroxyl ion present in water. Basic oxides can be formed by direct combination of metals with oxygen. For e.g., CaO+H2O→Ca(OH)2

The correct option is B
Adding water to a metal oxide.

When basic oxides react with water, they form bases by getting associated with the hydroxyl ion present in water. Basic oxides can be formed by direct combination of metals with oxygen. For e.g.,
$C a O + H_{2} O \to C a (O H)_{2}$