Question

2NaCl(aq) + Ba(NO3)2(aq) -> BaCl2(aq) + 2NaNo3 (aq) is it an redox reaction use oxidation number to explain why or why not

Answer 1

The answer is no, it's not a redox reaction. The oxidation numbers of the elements do not change in the reaction. In a redox reaction, there would be a change in oxidation states of one or more elements, which isn't happening here.