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

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

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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 $CaF_2$ (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 $CaCO_3 \cdot MgCO_3$.

List-$I$	List-$II$
$(P) \ [M(CN)_2]^-$	$(1) \ Ni$ (during refining of metal)
$(Q) \ [M(CO)_4]$	$(2) \ Ti$ (during refining of metal)
$(R) \ MI_4$	$(3) \ Pb$ (during roasting of ore)
$(S) \ MO$	$(4) \ Ag$ (during leaching of ore)

Which of the following statements is not correct?

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In the equation: $M + 8CN^{-} + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^- + 4OH^{-}$,metal $M$ is

Correctly match the List-$I$ with List-$II$:

List-$I$ List-$II$

$(P) \ [M(CN)_2]^-$ $(1) \ Ni$ (during refining of metal)

$(Q) \ [M(CO)_4]$ $(2) \ Ti$ (during refining of metal)

$(R) \ MI_4$ $(3) \ Pb$ (during roasting of ore)

$(S) \ MO$ $(4) \ Ag$ (during leaching of ore)

Identify the alloy containing a non-metal as a constituent in it.

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