Consider the following:Statement-I : In the e | vedclass

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(C) Statement-$I$ is correct. In the Hall-Heroult process,pure $Al_2O_3$ has a very high melting point and is a poor conductor of electricity. Adding

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Statement-$I$ is correct,but statement-$II$ is not correct

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(C) Statement-$I$ is correct. In the Hall-Heroult process,pure $Al_2O_3$ has a very high melting point and is a poor conductor of electricity. Adding $Na_3AlF_6$ (cryolite) and $CaF_2$ (fluorspar) lowers the melting point of the mixture and increases its electrical conductivity.Statement-$II$ is incorrect. Zirconium $(Zr)$ is purified by the Van Arkel method,which involves the formation of a volatile iodide $(ZrI_4)$ followed by its thermal decomposition. Zone refining is typically used for semiconductors like $Si$ and $Ge$.

Consider the following:
Statement-$I$ : In the extraction of $Al$ by Hall-Heroult process,pure $Al_2O_3$ mixed with $Na_3AlF_6$ lowers its melting point and increases conductivity.
Statement-$II$ : Zirconium metal is purified by zone refining method.

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Consider the following:Statement-$I$ : In the extraction of $Al$ by Hall-Heroult process,pure $Al_2O_3$ mixed with $Na_3AlF_6$ lowers its melting point and increases conductivity.Statement-$II$ : Zirconium metal is purified by zone refining method.