Dissolving metallic zinc in `NaOH` produces

Dissolving metallic zinc in access of NaOH produces:

Ethylene dibromide is heated with metallic zinc in the presence of alcohol. The gas so produced in the presence of alcohol. The gas so produced is allowed to react with hydrogen bromide. The product is :

Zinc metal is refined by:

Zinc reacts with NaOH solution to produce

(a). The addition of NaOH solution to a solution of zinc chloride produces a white precipitate which dissolves on further addition of NaOH. (b). The addition of NH_4OH to ZnSO_4 solution produces white precipitate but no precipitate is formed if it contains NH_4Cl .