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Chemistry

Choose the reaction which is not a precipitation reaction under prevalent conditions.

  1. Pb(NO3)2 + NaOH ⟶
  2. Pb(NO3)2 + Na2SO4
  3. Pb(NO3)2 →Δ\xrightarrow{\Delta}
  4. Pb(NO3)2 + NaCl

Chemical Reaction

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Answer

Pb(NO3)2 →Δ\xrightarrow{\Delta}

Reason — A precipitation reaction is a double decomposition reaction in which two compounds in aqueous solution react to form two new compounds, one of which is an insoluble precipitate. On heating, Pb(NO3)2 undergoes thermal decomposition, not precipitation.

Pb(NO3)2 →Δ\xrightarrow{\Delta} PbO + NO2 + O2

The other reactions form insoluble lead salts or lead hydroxide as precipitates:

  1. Pb(OH)2
  2. PbSO4
  3. PbCl2

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