Occurrence and Extraction — Prelims Questions

Which of the following statements about the occurrence and extraction of alkali metals is INCORRECT?

Which of the following minerals is a significant source of potassium?

During the electrolysis of molten NaCl in the Downs process, what are the products formed at the cathode and anode, respectively?

Why is the electrolysis of aqueous solutions of alkali metal salts not suitable for their extraction?

Which of the following methods is generally used for the extraction of Rubidium and Caesium?

Which of the following statements correctly describes the role of the steel gauze diaphragm in the Downs cell?