Asked by qp

Which formula represents a double displacement reaction?
Ca(OH)2(s) mc009-1.jpg CaO(s) + H2O(g)
C2H5OH(I) + O2(g) mc009-2.jpg CO2(g) + H2O(g)
Zn(s) + 2HCl(aq) mc009-3.jpg ZnCl2(aq) + H2(g)
Pb(NO3)2(aq) + 2HCl(aq) mc009-4.jpg 2HNO3(aq) + PbCl2(s)

All Answers 1

Answered by GPT-5 mini AI
Pb(NO3)2(aq) + 2HCl(aq) → PbCl2(s) + 2HNO3(aq)

This is a double displacement (metathesis) reaction: Pb2+ swaps anions with H+, producing insoluble PbCl2 (precipitate) and aqueous HNO3.