H2SO4 + NaCl \(\to\) NaHSO4 + HCl
Fe +H2SO4 \(\to\) FeSO4 + H2
4HCl + MnO2 \(\to\) MnCl2 + 2H2O + Cl2
Na2SO4 + pb(NO3) \(\to\) PbSO4 + 2NaNO
CuO +2HCl \(\to\) Cl2 + H2O
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The correct answer is D. Na₂SO₄ + Pb(NO₃)₂ → PbSO₄ + 2NaNO₃.
This reaction represents a precipitation reaction because:
- A solid precipitate (PbSO₄) forms from a solution.
- The reaction involves the combination of two solutions (sodium sulfate and lead(II) nitrate) to form an insoluble solid (lead(II) sulfate).
The other options do not represent precipitation reactions:
- A. This reaction involves the formation of a new solution, not a precipitate.
- B. This reaction is an acid-metal reaction, where hydrogen gas is produced, but no precipitate forms.
- C. This reaction involves the oxidation of manganese dioxide and the production of chlorine gas, but no precipitate forms.
- E. This reaction involves the reaction of copper(II) oxide with hydrochloric acid, producing copper(II) chloride, water, and chlorine gas, but no precipitate forms.
