According to reference Table J, which reaction will occur spontaneously?
1) Co2+ + Cu(s) → Co(s) + Cu2+
2) Ag+ + Cu(s) → Ag(s) + Cut
3) Fe2+ + Hg(e) → Fe(s) + Hg2+
4) Mg2+ + Sn2+ + Mg(s) + Sn++

The answer is nitrogen-containing bases

It would be c. risk.

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.