The equation Na2S+2HCl→2NaCl+H2S is an example of which of the following types of reaction?

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Single displacement reaction

Combination reaction

Double displacement reaction

None of these

answer is C.

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Detailed Solution

The equation Na2S+2HCl→2NaCl+H2S is an example of a double displacement reaction.
A double displacement reaction is a chemical reaction in which the reactant ions exchange to form new products. Generally, a double displacement reaction results in ionic reaction formation. The chemical bonds between the reactants can be covalent or ionic.
In these reactions, two compounds exchange the ions to form two new compounds. Hydrochloric acid reacts with sodium sulphite, forming sodium chloride and sulphur dioxide, which makes it smell like burning sulphur. It is a colourless gas with the suffocating smell of burning sulphur.
Na2S+2HCl→2NaCl+H2S

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