Question

which of the following is a double replacement reaction? 2ag + h₂s → ag₂s + h₂ c₃h₈ + 5o₂ → 3co₂ + 4h₂o 2ki + pb(no₃)₂ → 2kno₃ + pbi₂ rewatch

Explanation:

• In a double - replacement reaction, the positive and negative ions of two ionic compounds exchange places.
• For the reaction \(2Ag + H_2S

ightarrow Ag_2S + H_2\), it is a single - replacement reaction where \(Ag\) replaces \(H\) in \(H_2S\).

• For the reaction \(C_3H_8+5O_2

ightarrow 3CO_2 + 4H_2O\), it is a combustion reaction.

• For the reaction \(2KI+Pb(NO_3)_2

ightarrow 2KNO_3+PbI_2\), the \(K^+\) from \(KI\) combines with \(NO_3^-\) from \(Pb(NO_3)_2\) and \(Pb^{2 +}\) from \(Pb(NO_3)_2\) combines with \(I^-\) from \(KI\), which is characteristic of a double - replacement reaction.

Answer:

\(2KI + Pb(NO_3)_2
ightarrow 2KNO_3+PbI_2\)