Which reaction is single replacement?

1. [tex]2H_2O_2 \rightarrow 2H_2O + O_2[/tex]

2. [tex]2H_2 + O_2 \rightarrow 2H_2O[/tex]

3. [tex]H_2SO_4 + Mg \rightarrow H_2 + MgSO_4[/tex]

4. [tex]HCl + KOH \rightarrow KCl + H_2O[/tex]

In a single replacement reaction (or simple displacement) an element reacts with a compound and takes the place of another element in that compound. The reaction that shows a sigle replacement is the third one. Where H2SO4 and Mg turn into H2 + MgSO4. In this case Mg replaces H2

Answered by W0lf93 | 2024-06-11

Among the given choices, the third option is the only one which illustrates single replacement. (3)H2SO4 + Mg --> H2 + MgSO4
A single replacement is also termed as single-displacement reaction, a reaction by which an element in a compound, displaces another element. It can be illustrated this way: X + Y-Z → X-Z + Y

Answered by Kalahira | 2024-06-24

The only single replacement reaction from the given options is option 3: H 2 ​ S O 4 ​ + M g → H 2 ​ + M g S O 4 ​ . In this reaction, magnesium displaces hydrogen from sulfuric acid. The other reactions represent different types such as decomposition, synthesis, and neutralization.
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Answered by Kalahira | 2024-08-07