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Extracting Metals in the Middle of Reactivity Series

When manganes...

Question

When manganese dioxide is heated with aluminium powder, the products obtained are:

A

Mn,

A l_{2} O_{3}

and heat

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B

MnO and

A l_{2} O_{3}

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C

MnO,

A l_{2} O_{3}

and heat

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D

Mn, and

A l_{2} O_{3}

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Solution

The correct option is A Mn, $A l_{2} O_{3}$ and heat
When manganese dioxide is heated with aluminium powder, the products obtained are $M n$ , $A l_{2} O_{3}$ and heat.
$3 M n O_{2} + 4 A l \to 3 M n + 2 A l_{2} O_{3} +$ $h e a t$

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Q. Aluminium is obtained from

A l_{2} O_{3}

$A l_{2} O_{3}$ can be converted to anhydrous $A l C l_{3}$ by heating.

Q. Aluminium is obtained by the electrolysis of pure

A l_{2} O_{3}

, dissolved in:

Q. Aluminium oxide,

A l_{2} O_{3}

Q. In the following sets of reactants which two sets exhibit the amphoteric character of

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O H^{-} (a q)

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H_{2} O (l)

A l_{2} O_{3} . x H_{2} O

H^{+} (a q)

A l_{2} O_{3} . x H_{2} O

N H_{3} (a q)

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Extracting Metals in the Middle of Reactivity Series

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