1
MCQ (Single Correct Answer)

AIPMT 2009

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
MCQ (Single Correct Answer)

AIPMT 2008

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
MCQ (Single Correct Answer)

AIPMT 2007

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
MCQ (Single Correct Answer)

AIPMT 2007

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.

EXAM MAP

Joint Entrance Examination

JEE Advanced JEE Main

Graduate Aptitude Test in Engineering

GATE CE GATE ECE GATE ME GATE IN GATE EE GATE CSE GATE PI

Medical

NEET

CBSE

Class 12