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1

AIPMT 2009

MCQ (Single Correct Answer)
The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence
A
Al < Ga < In < Tl
B
Tl < In < Ga < Al
C
In < Tl < Ga < Al
D
Ga < In < Al < Tl

Explanation

The given elements belong to 13th group. The elements mainly exhibit +3 and +1 oxidation states. As we know, the stability of lower oxidation state i.e., +1 state, increases on moving down the group due to inert pair effect. The, stability follows the order :

Al < Ga < In < Tl
2

AIPMT 2008

MCQ (Single Correct Answer)
The angular shape of ozone molecule (O3) consists of
A
1$$\sigma $$ and 1$$\pi $$ bond
B
2$$\sigma $$ and 1$$\pi $$ bond
C
1$$\sigma $$ and 2$$\pi $$ bonds
D
2$$\sigma $$ and 2$$\pi $$ bonds

Explanation

O3 molecule can be represented as

3

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.
4

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.

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