Which of the following reactions is NOT an example of a displacement reaction?

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RRB Group D 2 Sept 2022 Shift 3 Official Paper
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  1. Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
  2. Pb(s) + CuCl2(aq) → PbCl2(aq) + Cu(s)
  3. 2AgBr(s) \(\rm \xrightarrow{Sunlight}\) 2Ag(s) + Br2(g)
  4. Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)

Answer (Detailed Solution Below)

Option 3 : 2AgBr(s) \(\rm \xrightarrow{Sunlight}\) 2Ag(s) + Br2(g)
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Detailed Solution

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The correct answer is '2AgBr(s) \(\rm \xrightarrow{Sunlight}\) 2Ag(s) + Br2(g)'.

Key Points

  •  A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule.
  • For instance, when iron is added to a copper sulphate solution, it displaces the copper metal.
  • A + B-C → A-C + B.
  • The above equation exists when A is more reactive than B.

Additional Information

  • The displacement reaction is the one whether the atom or group of atom are displaced by the atom or group of atoms.
  • The starting materials are always pure elements, such as a pure zinc metal or hydrogen gas, plus an aqueous compound.
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