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Silver metal in ore is dissolved by potassium cyanide solution in the presence of air by the reaction
\[
4 \mathrm{Ag}+8 \mathrm{KCN}+\mathrm{O}_{2}+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow 4 \mathrm{~K}\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]+4 \mathrm{KOH}
\]
\( \mathrm{P} \)
(A) The amount of KCN required to dissolve \( 100 \mathrm{~g} \) of pure \( \mathrm{Ag} \) is \( 120 \mathrm{~g} \).
(B) The amount of oxygen used in this process is \( 0.742 \mathrm{~g} \) (for \( 100 \mathrm{~g} \) pure \( \mathrm{Ag} \) )
W
(C) The amount of oxygen used in this process is \( 7.40 \mathrm{~g} \) (for \( 100 \mathrm{~g} \) pure \( \mathrm{Ag} \) )
(D) The volume of oxygen used at STP is \( 5.20 \) litres.
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