Which of the following pair of metals are ext | vedclass

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(A) $1$. Metals like $Cu$ (from $Cu_2S$) and $Hg$ (from $HgS$) are extracted by self-reduction (roasting). $2$. Metals that are less reactive than hyd

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$Cu, Hg$

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(A) $1$. Metals like $Cu$ (from $Cu_2S$) and $Hg$ (from $HgS$) are extracted by self-reduction (roasting). $2$. Metals that are less reactive than hydrogen in the electrochemical series do not evolve $H_2$ gas when reacted with dilute acids like $H_2SO_4$. $3$. $Cu$ and $Hg$ are below hydrogen in the reactivity series,hence they do not displace $H_2$ from dilute $H_2SO_4$. $4$. $Zn$,$Pb$,$Mn$,and $Al$ are more reactive than hydrogen and will evolve $H_2$ gas.

Which of the following pair of metals are extracted by self-reduction from their main ores but do not evolve $H_2$ gas with dilute $H_2SO_4$?

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