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BITSAT 2015

Exam: BITSAT
Year: 2015
Subject: Chemistry
Chapter: p Block Elements (Group 13 & 14)

BITSAT 2015 · Chemistry · p Block Elements (Group 13 & 14)

Which of the following is the most basic oxide?

Which of the following is the most basic oxide?

Options

A $\mathrm{Sb}_{2} \mathrm{O}_{3}$
B $\mathrm{Bi}_{2} \mathrm{O}_{3}$
C $\mathrm{SeO}_{2}$
D $\mathrm{Al}_{2} \mathrm{O}_{3}$

Correct answer

B. $\mathrm{Bi}_{2} \mathrm{O}_{3}$

Step-by-step solution

More the oxidation state of the central atom (metal) more is its acidity. Hence

\mathrm{SeO}_{2}(\mathrm{O}. \mathrm{S}.

of

\mathrm{Se}=+4)

is acidic. Further for a given O.S., the basic character of the oxides increases with the increasing size of the central atom. Thus

\mathrm{Al}_{2} \mathrm{O}_{3}

and

\mathrm{Sb}_{2} \mathrm{O}_{3}

are amphoteric and

\mathrm{Bi}_{2} \mathrm{O}_{3}

is basic.

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