These are all chemical compounds that contain zinc.

ZnO (Zinc Oxide) - a white powdered mineral that is used in various products such as sunscreen, cosmetics, and rubber.

ZnSO4 (Zinc Sulfate) - a white crystalline compound that is commonly used as a dietary supplement and in the production of fertilizers.

K2ZnO2 (Potassium Zincate) - a white solid compound that is used in the production of zinc electrolytes and as a reagent in chemical reactions.

Zn(OH)2 (Zinc Hydroxide) - a white solid compound that is used in various industrial applications, such as in the production of rubber and plastics.

These compounds can have different properties and uses depending on their chemical structure and composition.