in regards to electrochemistry,

Can Na metal displace Zn2+ in a single replacement reaction?

yes

A metal will displace any metal ION BELOW it in the activity series. Here is the activity series chart.
http://www.cod.edu/people/faculty/jarman/richenda/1551_hons_materials/Activity%20series.htm

Yes, Na metal can indeed displace Zn2+ in a single replacement reaction. This is possible due to the reactivity series or activity series of metals. In the reactivity series, metals are ranked based on their ability to displace other metals from their compounds.

To determine whether Na can displace Zn2+ in a single replacement reaction, you can refer to the reactivity series of metals. This series arranges common metals in order of decreasing reactivity, with the most reactive metal at the top.

In the reactivity series, Na (sodium) is more reactive than Zn (zinc). Therefore, sodium has the ability to displace zinc from its compounds. In this case, the single replacement reaction would be:

Na (s) + ZnSO4 (aq) → Na2SO4 (aq) + Zn (s)

Sodium (Na) would react with zinc sulfate (ZnSO4) to form sodium sulfate (Na2SO4) and solid zinc (Zn).

It's important to note that displacement reactions depend on the positioning of metals in the reactivity series. If the metal seeking to displace another is lower in the series, it will not be able to displace the metal above it. However, metals above in the series can displace those underneath them.