Net ionic equation for precipitation Steps:

• Write molecular equation: Pb(NO₃)₂(aq) + 2HCl(aq) → PbCl₂(s) + 2HNO₃(aq).
• Dissociate into ions: Pb²⁺(aq) + 2NO₃⁻(aq) + 2H⁺(aq) + 2Cl⁻(aq) → PbCl₂(s) + 2H⁺(aq) + 2NO₃⁻(aq).
• Identify spectators: NO₃⁻ and H⁺ unchanged on both sides.
• Cancel spectators for net ionic: Pb²⁺(aq) + 2Cl⁻(aq) → PbCl₂(s).

Why B is correct:

• Net ionic equations show only reacting species, excluding spectators, per standard chemistry definition.

Why the others are wrong:

• A: Mixes ions and molecules; HCl should be 2Cl⁻(aq), and H⁺ is spectator.
• C: Full molecular equation, includes undissociated compounds.
• D: Total ionic equation, fails to cancel spectator ions.

Final answer: B