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Which method is used for refining Zr and Ti? Explain with equation.

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van Arkel method is used for refining Zr and Ti. In this method crude metal is heated with iodine.

Zr + 2I2 → ZrI4

ZrI4 +1800K ⎯⎯→ Zr + 2I2 39. 

Generally, two things are considered so that proper precautions can be taken.

(i) reactivity of metal produced.

(ii) suitability of electrodes.

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