Q.In which process, fused sodium hydroxide is electrolysed for extraction of sodium ?

Step 1. The question specifically describes electrolysing FUSED SODIUM HYDROXIDE to obtain sodium metal.

Step 2. Castner's process is the historic industrial method that does exactly this -- electrolysing molten NaOH to deposit sodium metal at the cathode. …

Match the specific electrolyte named in the question (fused NaOH) to the correct …

• Confusing Castner's process (electrolysis of fused NaOH) with Down's process (electrolysis of fused NaCl) -- both extract sodium metal by …