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Q.

Which of the reaction is suitable for concentrating ore by leaching process ?

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a

${Fe}_{3} O_{4} + CO \to 3 FeO + {CO}_{2}$

b

${AI}_{2} O_{3} + 2 NaOH + 3 H_{2} O \to 2 Na, [AI {(OH)}_{4}]$

c

${AI}_{2} O_{3} + 6 Mg \to 6 Mg \to 6 MgO + 4 AI$

d

$2 {Cu}_{2} S + 3 O_{2} \to 2 {Cu}_{2} O + 2 {SO}_{2}$

answer is C.

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Detailed Solution

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${AI}_{2} O_{3} + 2 NaOH + 3 H_{2} O \to 2 Na, [AI {(OH)}_{4}]$ Leaching

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