EXERCISES
1. From the method of preparation of platinum, what metal is likely to be alloyed with it?
2. The "platinum chloride" of the laboratory is made by dissolving platinum in aqua regia. What is the compound?
3. How would you expect potassium aurate and platinate to be formed? What precautions would this suggest in the use of platinum vessels?
4. Why must gold ores be roasted in the chlorination process?