Which of the following statements is not corr | vedclass

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(D) The correct answer is $D$. $Al$ is extracted by the electrolytic reduction of fused $Al_2O_3$ mixed with $Na_3AlF_6$ (cryolite) and $CaF_2$ (fluor

Vedclass · Accepted Answer

Aqueous $Al_2(SO_4)_3$ is used for electrorefining of $Al$.

Vedclass · Answer

(D) The correct answer is $D$. $Al$ is extracted by the electrolytic reduction of fused $Al_2O_3$ mixed with $Na_3AlF_6$ (cryolite) and $CaF_2$ (fluorspar) to lower the melting point and increase conductivity. Aqueous $Al_2(SO_4)_3$ cannot be used for the electrorefining of $Al$ because $Al$ is more reactive than $H_2$ and would react with water to produce $H_2$ gas instead of depositing $Al$ at the cathode. Option $A$ is correct as pine oil acts as a frother. Option $B$ is correct as poling is used to remove impurities like $Cu_2O$ from molten copper. Option $C$ is correct as dolomite is $CaCO_3 \cdot MgCO_3$.

Which of the following statements is not correct?

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