Oxides of Sulphur

Q. Hydrogen peroxide, in its reaction with $KI{O}_4$ and $N{H}_{2}OH$ respectively, is acting as a:

1. reducing agent, oxidising agent
2. reducing agent, reducing agent
3. oxidising agent, oxidising agent
4. oxidising agent, reducing agent

Q. What is the sum of the lowest oxidation states of sulphur in the following species:
$S_4{O}_6^{2-},S_2{O}_3^{2-},S_2{O}_8^{2-},S_2{O}_7^{2-}$

Q. Which of the followings pair is not present in acid rain (if any one acid in the given pair is not present, then that pair is considered to be not present)-

1. $H_{2}C{O}_{3}and{H}_{2}S{O}_3$
2. $HN{O}_{3}and{H}_{2}C{O}_3$
3. $H_{2}S{O}_{4}and{H}_{3}P{O}_4$
4. $H_{2}S{O}_{3}and{H}_{3}S{O}_4$

Q.

Photochemical smog is also known as:

1. Oxidizing smog

2. Phytochemical smog

3. Classic smog

4. Reducing smog

Q. Which of the following oxyanions contain S-S (single bond)?

1. $S_2{O}_7^{2-}$
2. $S_2{O}_6^{2-}$
3. $S_2{O}_5^{2-}$
4. $S_2{O}_4^{2-}$

Q. $S{O}_2$, as a pollutant can be controlled by:
(I) Using solar energy, nuclear energy, hydroelectric energy.
(II) Using low-sulphur fuels, natural gas.
(III) The desulphurisation of high-sulphur coal and oil before burning by FGD (Fuel-gas desulphurisation).
(IV) Using water under high pressure.
The correct methods are:

1. Both I and II
2. Both I and III
3. I, II and IV
4. I, II and III

Q. The correct statements among the following are:
I. $Sn{O}_2$ has an amphoteric character.
II. $O_3$ is a linear molecule.
III. Sulphur has oxidation states of +5 and +3 in disulphurous acid.

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