Which one of the following metals can not be extracted by using Al as a reducing agent ________________.

N a

from

{N a}_{2} O

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C r

from

{C r}_{2} O_{3}

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M n

from

{M n O}_{2}

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F e

from

{F e}_{2} O_{3}

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Solution

The correct option is A $N a$ from ${N a}_{2} O$
As sodium (alkali metal) is more reactive than Al so it cannot be extracted from $N a_{2} O$ by using Al as a reducing agent.

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(a) Na
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${F e}_{2} O_{3}$ + $A l$ $\to$ $F e$ + ${A l}_{2} O_{3}$
This is the reaction used in thermite welding process. Calcium can also be used instead of aluminium in this process.

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Q. Which of the following transformations can be carried out by using HI as a reducing agent, under acidic conditions?[Given:

I_{2} (s) \to 2 I^{-}

;

E^{⊖} = 0.54 V]

(i)

C u^{+} \to C u (s); E^{⊖} = 0.52 V

(ii)

C r^{3 +} \to C r^{2 +}; E^{⊖} = - 0.41 V

(iii)

F e^{3 +} \to F e^{2 +}; E^{⊖} = 0.77 V

(iv)

F e^{2 +} \to F e (s); E^{⊖} = - 0.44 V

Q. Extraction of metals from their ores by chemical methods requires the use of reducing agent.

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Which one of the following metals can not be extracted by using Al as a reducing agent ________________.

The correct option is A Na from Na2OAs sodium (alkali metal) is more reactive than Al so it cannot be extracted from Na2O by using Al as a reducing agent.

The correct option is A $N a$ from ${N a}_{2} O$
As sodium (alkali metal) is more reactive than Al so it cannot be extracted from $N a_{2} O$ by using Al as a reducing agent.