Electrochemistry — Chemistry STD 12 Science — Question

$Fe ^{2+} \rightarrow Fe ^{3+} + e ^{-} \quad E _{ Fe ^{3+} / Fe ^{2+}}=0.77 \,V$

$2 I ^{-} \rightarrow I _{2}+2 e ^{-} \quad E _{ I _{2} / I ^{-}}^{0}=0.54 \,V$

The standard electrode potential for the spontaneous reaction in the cell is $x \times 10^{-2} \,V 298$ $K$. The value of $x$ is .... (Nearest Integer)

$\xrightarrow{{P + {I_2}}}\,\xrightarrow{{AgN{O_2}}}\,\xrightarrow{{HN{O_2}}}\,\,\xrightarrow{{NaOH}}$

$(I)\,\, O_3 \to $ product

$(II)\,\,C{r_2}O_7^{ - 2}\xrightarrow{{{H^ + }}}$ product

$(III)\,\,MnO_4^\Theta \xrightarrow{{{H^ + }}}$ product

$(IV)\,\, H_2S \to $ product

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($1$) The compound $R$ is

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($2$) The compound $S$ is

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Give the answer or quetion ($1$) and ($2$)