1. The chemical equation \(Na_2SO_{4(aq)}+BaCl_{2(aq)}→BaSO_{4(s)↓}+2NaCl_{(aq)}\) represents which of the following types of reaction?
2. A single displacement reaction is represented by \(X_{(s)}+2HCl_{(aq)}→XCl_{2(aq)}+H_{2(g)}\). Which of the following(s) could be \(X\).
(i) \(Zn\)
(ii) \(Ag\)
(iii) \(Cu\)
(iv) \(Mg\)
Choose the best pair.
(i) \(Zn\)
(ii) \(Ag\)
(iii) \(Cu\)
(iv) \(Mg\)
Choose the best pair.