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Which reaction is single replacement?

(1) 2H2O2 --> 2H2O + O2


(2) 2H2 + O2 --> 2H2O


(3) H2SO4 + Mg --> H2 + MgSO4


(4) HCl + KOH --> KCl + H2O

Verified Answer :

Kalahira

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

W0lf93

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

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