Which of the following combinations of reagen | vedclass

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(C) $(a) \, SnCl_2 + HgCl_2 \xrightarrow{	ext{Redox}} Hg \downarrow + SnCl_4$ (Redox reaction)$(b) \, CuSO_4 + KCN 	o K_2SO_4 + Cu(CN)_2 \downarrow

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$Pb(CH_3COO)_2 + KI$

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(C) $(a) \, SnCl_2 + HgCl_2 \xrightarrow{	ext{Redox}} Hg \downarrow + SnCl_4$ (Redox reaction)$(b) \, CuSO_4 + KCN 	o K_2SO_4 + Cu(CN)_2 \downarrow \xrightarrow{	ext{Redox}} Cu(CN) \downarrow + (CN)_2 \uparrow$ (Redox reaction)$(c) \, Pb(CH_3COO)_2 + KI \xrightarrow{	ext{Ion Exchange}} PbI_2 \downarrow + CH_3COOK$ (This is a double displacement reaction,not a redox reaction)$(d) \, Ag_2O + SO_2 \xrightarrow{	ext{Redox}} 2Ag + SO_3$ (Redox reaction)

Which of the following combinations of reagents does not undergo a redox reaction in an aqueous medium?

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