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Question

Which reaction is NOT a displacement reaction?

This question was previously asked in
RRB ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is
$HCl + NaOH \rightarrow NaCl + H_2O$

Reaction Identification: Displacement Reactions

A displacement reaction occurs when a more reactive element replaces a less reactive element in a compound. We need to identify the reaction among the options that does not fit this definition.

Analyzing Reaction Types

Let's examine each reaction:

  • Option 1: \(Na + H_2O \rightarrow NaOH + H_2\)
    Sodium (Na) is highly reactive and displaces Hydrogen (H) from water. This is a single displacement reaction.
  • Option 2: \(HCl + NaOH \rightarrow NaCl + H_2O\)
    This is a reaction between an acid (HCl) and a base (NaOH). It forms a salt (NaCl) and water (\(H_2O\)). This specific type of reaction is called a neutralization reaction, not a displacement reaction.
  • Option 3: \(Fe + CuSO_4 \rightarrow FeSO_4 + Cu\)
    Iron (Fe) is more reactive than Copper (Cu). Iron displaces Copper from Copper sulfate solution. This is a single displacement reaction.
  • Option 4: \(Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2\)
    Zinc (Zn) is more reactive than Hydrogen (H). Zinc displaces Hydrogen from Sulfuric acid. This is a single displacement reaction.

Conclusion on Reaction Type

Based on the analysis, the reaction \(HCl + NaOH \rightarrow NaCl + H_2O\) is a neutralization reaction and does not involve the displacement of one element by another. Therefore, it is the reaction that is NOT a displacement reaction.

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