Question

The process of purification of metal represented by the following equation is called \[ \text{Ti} + \text{I}_2 \xrightarrow{773\,K} \text{TiI}_4 \xrightarrow{1675\,K} \text{Ti} + \text{I}_2 \]

• A. Cupellation
• B. Poling
• C. Van Arkel
• D. Zone refining

Hint:

Zone refining is an efficient method for purifying metals by melting and recrystallizing them, often used for high-purity materials.

Answer 1

The Correct Option is D

Step 1: Understand the given process.
The given equation shows the process where Titanium (Ti) reacts with chlorine to form Titanium tetrachloride (TiCl4) and then undergoes a further reaction at a higher temperature, resulting in the formation of Titanium metal. This process is used for the purification of metals.
Step 2: Identify the purification process.
- Cupellation is a process used to separate noble metals from base metals by heating them in a special furnace. - Poling is a method used for removing dissolved gases from molten metals. - Van Arkel method is used for the purification of certain metals, especially titanium, by converting them into a volatile compound, which is then decomposed. - Zone refining is a process used to purify metals by melting a small region of the metal and then moving it along the metal rod, gradually purifying the material as impurities concentrate in the molten region.
Step 3: Apply to the options.
The process shown in the equation is similar to the Zone refining process, used extensively for purifying metals like titanium.
Final Answer: \[ \boxed{\text{Zone refining}} \]