JEE Main Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main

Not in JEE Main or NEET syllabus

In Down's method for the extraction of sodium, the melting point of the electrolyte is lowered by adding [WB-JEE 2007]

(A)Potassium chloride
(B)Calcium chloride
(C)Both calcium chloride and potassium fluorideCorrect
(D)Potassium fluoride only

Answer: (C)

Solution

In Down's process, pure NaCl melts at a very high 1085 K, which is industrially inconvenient. A mixture of and is added to NaCl, lowering the melting point of the electrolyte to about 850 K (around 600°C).

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-137537