1
MCQ (Single Correct Answer)

AIPMT 2006

Which of the following is the most basic oxide?
A
SeO2
B
Al2O3
C
Sb2O3
D
Bi2O3

Explanation

SeO2 $$ \to $$ acidic oxide

Al2O3 $$ \to $$ amphoteric,

Sb2O3 $$ \to $$ amphoteric

Bi2O3 $$ \to $$ basic oxide.
2
MCQ (Single Correct Answer)

AIPMT 2005

Which one of the following orders correctly represents the increasing acid strengths of the given acids?
A
HOClO < HOCl < HOClO3 < HOClO2
B
HOClO3 < HOClO2 < HOClO < HOCl
C
HOClO2 < HOClO3 < HOClO < HOCl
D
HOCl < HOClO < HOClO2 < HOClO3

Explanation



As the oxidation number of the central atom increases, strength of acid also increases.
3
MCQ (Single Correct Answer)

AIPMT 2005

What is the correct relationship between the pH of isomolar solutions of sodium oxide, Na2O (pH1), sodium sulphide, Na2S (pH2), sodium srlenide, Na2Se (pH3) and sodium telluride Na2Te (pH4)?
A
pH1 > pH2 > pH3 > pH4
B
pH1 > pH2 $$ \approx $$ pH3 > pH4
C
pH1 < pH2 < pH3 < pH4
D
pH1 < pH2 < pH3 $$ \approx $$ pH4

Explanation

Basic character decreases down the group Thus Na2O is most basic.



We know that more the basic compound more is the pH.

Hence, pH1 > pH2 > pH3 > pH4
4
MCQ (Single Correct Answer)

AIPMT 2005

Which of the following would have a permanent dipole moment?
A
SiF4
B
SF4
C
XeF4
D
BF3

Explanation

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