Question 32

HClO4 + NH4OH → NH4ClO4 + H2O is an example of an acid-base neutralization reaction.

In this reaction, hydrochloric acid (HClO4) reacts with ammonium hydroxide (NH4OH) to produce ammonium perchlorate (NH4ClO4) and water (H2O), demonstrating the characteristics of an acid-base neutralization.

A) NaCl + H2O → Na+ + Cl− + H2O

This equation represents the dissolution of sodium chloride in water, resulting in the dissociation of its ions. It does not illustrate an acid-base neutralization because there is no reaction between an acid and a base leading to the formation of water.

B) H2 + Br2 → HBr

This reaction shows the formation of hydrogen bromide from hydrogen and bromine. It is a combination reaction and does not involve an acid and a base reacting to neutralize each other.

C) 2 HCl + Mg → MgCl2 + H2

This equation depicts a reaction between hydrochloric acid and magnesium, producing magnesium chloride and hydrogen gas. While it involves an acid, it is not an acid-base neutralization reaction because it does not produce water as a product.

D) HClO4 + NH4OH → NH4ClO4 + H2O

This reaction is a classic example of acid-base neutralization, where the strong acid (HClO4) reacts with the weak base (NH4OH) to yield a salt (NH4ClO4) and water (H2O), fulfilling the criteria for neutralization.

Conclusion

D is the only option that correctly exemplifies an acid-base neutralization reaction, as it results in the formation of water and a salt. The other options either depict different types of chemical reactions or fail to meet the neutralization criteria by not producing water. Thus, option D is definitively the correct answer.