The following equations represent reactions used in some important metallurgical processes-1- Fe3O4 - COg - Fel - CO2g2- MgCO3s - SiO2s - MgSiO3l - CO2g3- Aus - CN-aq - H2Ol - O2g - -AuCN2-aq OH-aq Which one s represent reduction to a free metal-

The following represents reduction to free metal: Fe_3O_4 + CO(g) → Fe(l) + CO_2(g) #160; #160; +8/3 #160; #160; #160; #160; #160; ...

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The following equations represent reactions used in some important metallurgical processes:
1. $F e_{3} O_{4} + C O (g) \to F e (l) + C O_{2} (g)$
2. $M g C O_{3} (s) + S i O_{2} (s) \to M g S i O_{3} (l) + C O_{2} (g)$
3. $A u (s) + C N^{-} (a q) + H_{2} O (l) + O_{2} (g) \to [A u (C N)_{2}]^{-} (a q) O H^{-} (a q)$
Which one (s) represent reduction to a free metal?

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C u_{2} O

H_{2} O (g) \to H_{2} O (l)

F e^{2 +} (a q) + S^{2 -} (a q) \to F e S (s)

2 S O_{3} (g) ⇋ 2 S O_{2} (g) + O_{2} (g)

H^{+} (a q) + O H^{-} (a q) = H_{2} O (l); Δ H = - X_{1} k J . m o l^{- 1}

H_{2} (g) + \frac{1}{2} O_{2} (g) = H_{2} O (l); Δ H = - X_{2} k J . m o l^{- 1}

C O_{2} (g) + H_{2} (g) = C O (g) + H_{2} O (l); Δ H = + X_{3} k J . m o l^{- 1}

C_{2} H_{2} (g) + \frac{5}{2} O_{2} (g) = 2 C O (g) + H_{2} O (l); Δ H = + X_{4} k J . m o l^{- 1}

H_{2} O (l)

M n O_{4}^{-} (a q) + C_{2} H_{2} O_{4} (a q) \to M n^{2 +} (a q) + C O_{2} (g) + H_{2} O (l)

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