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Question

Which of these following substances will neutralise each other?

A
Sodium hydroxide and potassium hydroxide
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B
Hydrochloric acid and sulphuric acid
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C
Hydrochloric acid and potassium hydroxide
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D
Sulphuric acid and water
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Solution

The correct option is C Hydrochloric acid and potassium hydroxide
When definite amounts of acid and base (alkali) are mixed, they neutralise each other forming salt and water. The general representation is given below.

Acid + Base Salt + Water

Thus, hydrochloric acid and potassium hydroxide neutralise each other forming potassium chloride and water. The reaction can be represented as:

Hydrochloric acid + Potassium hydroxide Potassium chloride + Water

Sodium hydroxide and potassium hydroxide are bases. Two bases cannot neutralise each other. Similarly, hydrochloric acid and sulphuric acid will not neutralise each other as both are acids. Also, water does not neutralise an acid or a base.


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