Which of the following pairs is incorrect?(a) | vedclass

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(C) The Goldschmidt alumino-thermite process is used for the reduction of metal oxides like $Cr_2O_3$ using $Al$. This is correct.The MacArthur-Forres

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$b, d$

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(C) The Goldschmidt alumino-thermite process is used for the reduction of metal oxides like $Cr_2O_3$ using $Al$. This is correct.The MacArthur-Forrest cyanide process is used for the extraction of $Ag$ or $Au$,not $Fe$. This is incorrect.The Mond process is used for the refining of $Ni$ by forming $Ni(CO)_4$. This is correct.The Van Arkel process is used for the refining of metals like $Zr$ or $Ti$,not $Au$. This is incorrect.Therefore,the incorrect pairs are $(b)$ and $(d)$.

Which of the following pairs is incorrect?
$(a)$ Goldschmidt alumino-thermite process $-$ $Cr_2O_3$
$(b)$ MacArthur-Forrest cyanide process $-$ $Fe$
$(c)$ Mond process $-$ $Ni$
$(d)$ Van Arkel process $-$ $Au$

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Which of the following pairs is incorrect?$(a)$ Goldschmidt alumino-thermite process $-$ $Cr_2O_3$$(b)$ MacArthur-Forrest cyanide process $-$ $Fe$$(c)$ Mond process $-$ $Ni$$(d)$ Van Arkel process $-$ $Au$