Oxides of Group 16

Q.

What are the two allotropes of oxygen?

Q.

Allotropes of oxygen are______

Q.

Between hydrogen fluoride and water:

1. HF has weaker hydrogen bonds

2. HF has the lower boiling point

3. Water has the lower boiling point

4. None of the above

Q. Which of the following is not correct about stibanes?

1. They decompose into Sb and $H_2$ on heating
2. They are basic in nature
3. They are formed by the decomposition of $S{b}_2{O}_3$ with $LiAl{H}_4$
4. They are formed by the decomposition of $SbC{l}_3$ with $NaB{H}_4$

Q. The oxidation state of Fe in brown ring complex is

1. +1
2. +2
3. +3
4. 0

Q.

Among the chalcogens, the element that forms an amphoteric dioxide is:

1. Sulphur

2. Selenium

3. Tellurium

4. Polonium

Q. The correct statement(s) among the following are:
I The most stable form (allotropic) of sulphur at room temperature is rhombic.
II Ozone is an allotropic form of oxygen and is a powerful reducing agent.
III The formula of oleum is $H_2{S}_2{O}_7$.

1. I, II and III
2. III only
3. I and III only
4. II and III only