Answer :
1. substance x is calcium oxide CaO . CaO + H2O = Ca(OH)2
2. yellow precipitate will form
Pb(NO3)2(aq) + 2KI(aq) = PbI2(s) + 2KNO3(aq)
yes it is a double displacement reaction
2. yellow precipitate will form
Pb(NO3)2(aq) + 2KI(aq) = PbI2(s) + 2KNO3(aq)
yes it is a double displacement reaction