Which one of the following is a double-displacement reaction?
A. Zn (s) + 2HCl (aq) - H2 (g) + ZnCl2 (s)

B. Ba(OH)2 (aq) + 2HClO4 (aq) - Ba(ClO4)2 (aq) + 2H20 (1)

C. 2503 (g) - 2502 (g) + 02 (g)

D. K2CO3 (s) - K20 (s) + CO2 (g)

The answer to your question is the letter B.

Explanation:

A double displacement reaction is a reaction in which the cation of a reactant displaces the cation of the other reactant and vice versa.

Examples of double-displacement reactions are Redox reactions or neutralization reactions.

Letter B is an example of a double displacement reaction because Barium displaces Hydrogen and vice versa. Also, this is a neutralization reaction because Ba(OH)₂ is a base and HClO₄ is an acid.

introduction of a drug directly into the respiratory tract is a form of inhalation administration.

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