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1

AIPMT 2007

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
HOClO2 < HOClO3 < HOClO < HOCl
C
HOClO3 < HOClO2 < HOClO < HOCl
D
HOCl < HOClO < HOClO2 < HOClO3

Explanation



As the oxidation number of the central atom increases, strength of acid also increases.
2

AIPMT 2007

MCQ (Single Correct Answer)
Which of the following anions is present in the chain structure of silicates?
A
(Si2O$$_5^{2 - }$$)n
B
(SiO$$_3^{2 - }$$)n
C
SiO$$_4^{4 - }$$
D
Si2O$$_7^{6 - }$$

Explanation

[SiO32–]n and [Si4O11]6– have chain structure of silicates.
3

AIPMT 2007

MCQ (Single Correct Answer)
Which of the following oxidation states are the most characteristic for lead and tin respectively?
A
+2, +4
B
+4, +4
C
+2, +2
D
+4, +2

Explanation

The tendency to from +2 ionic state increases on moving down the group due to inert pair effect. Most characteristic oxidation state for lead and tin are +2, +4 respectively.
4

AIPMT 2006

MCQ (Single Correct Answer)
In which of the following molecules are all the bonds are not equal?
A
NF3
B
ClF3
C
BF3
D
AlF3

Explanation

The Cl - F (Cl - Fb) bond length is equal to 1.60 $$\mathop A\limits^o $$ while each of two axial Cl - F (Cl - Fa) bond length is equal to 1.70 $$\mathop A\limits^o $$.

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