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Q.

A metal A, which is used in the thermite process when heated with oxygen gives an oxide B, which is amphoteric in nature. Oxide B is:

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a

{2 AlCl}_{3}

b

{Al}_{2} O_{3}

c

NaAl O_{3}

d

MgO

answer is B.

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Detailed Solution

concept - In the thermite process, a metal and a metal oxide react along with the evolution of a large amount of heat.
In the aluminium thermite process, aluminium acts as a reducing agent. In this process, the oxides of various metals (such as chromium, iron, etc.) are converted into the corresponding metals. For example, the reduction of iron oxide in the presence of aluminium leads to the formation of iron metal and aluminium oxide (

{Al}_{2} O_{3}) .

Therefore, metal A is aluminium and B is

{Al}_{2} O_{3}

. This oxide is amphoteric as shown it reacts with both acid and base-
Reaction of oxide B,

{Al}_{2} O_{3}

with

HCl

:

{Al}_{2} O_{3} + 6 HCl \to {2 AlCl}_{3} + 3 H_{2} O

Reaction of oxide B,

{Al}_{2} O_{3}

with

NaOH

:

{Al}_{2} O_{3} + 2 NaOH \to 2 NaAl O_{3} + H_{2} O

Hence, the correct answer is option 2.

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