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1

AIPMT 2006

MCQ (Single Correct Answer)
The correct order regarding the electronegativity of hybrid orbitals of carbon is
A
sp < sp2 < sp3
B
sp > sp2 < sp3
C
sp > sp2 > sp3
D
sp < sp2 > sp3

Explanation

Among the three given hybrid orbitals, sp hybrid orbital is most electronegative. Contribution of s in sp hybrid orbital is maximum (50%) so this orbital is closer to nucleus. Naturally it will have greater tendency to pull electron towards it. Hence it becomes more electronegative and sp3 becomes least electronegative as it has only 25% s-character.
2

AIPMT 2006

MCQ (Single Correct Answer)
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.
3

AIPMT 2005

MCQ (Single Correct Answer)
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.
4

AIPMT 2005

MCQ (Single Correct Answer)
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

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