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GUJCET 2024 Chemistry Paper

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Question : 3 of 40

Marks: +1, -0

Which one of the following is amphoteric oxide?

$Cr _2 O _3$
CrO
$CrO _3$
$V _2 O _3$

Solution:

Concept:

Amphoteric oxides react with both acids and bases.

Explanation:

Among chromium oxides,

\mathrm{CrO}

is basic,

\mathrm{Cr}_2\mathrm{O}_3

is amphoteric, and

\mathrm{CrO}_3

is acidic.

\mathrm{Cr}_2\mathrm{O}_3

reacts with acids to form

\mathrm{Cr}^{3+}

salts and with bases to form chromites.

Therefore,

\mathrm{Cr}_2\mathrm{O}_3

is the amphoteric oxide.

Answer:

A.

\mathrm{Cr}_2\mathrm{O}_3

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