Sulphur Trioxide

Q. Which is correct regarding the cyclic trimer of $S{O}_3$.

1. It contains three $S-S,\sigma$ bonds
2. It contains three $O-O,\sigma$ - bonds
3. It contains five $S-O,\pi$ bonds
4. The total no. of $\sigma$ and $\pi$ bonds in it are twelve and six respectively

Q. The compound that attacks borosilicate glass is:

1. $Xe{F}_2$
2. $Xe{F}_4$
3. $Xe{F}_6$
4. None of these

Q.

Sulphur trioxide gas is an important precursor to manufacture sulphuric acid. It is produced by the catalytic oxidation of $S{O}_2$ gas. Which of the following are suitable catalysts for the process?

1. Probiotic yoghurt

2. Sodium vapour

3. X-rays

4. $V_2{O}_5$

Q. In the laboratory $S{O}_3$ can be prepared by

1. Burning Hydrogen Sulphide in the air
2. Burning Sulphur in the air
3. Both a and b
4. By two stage pyrolysis Sodium hydrogen sulphate

Q. Oxidation of Sulphur to Sulphur trioxide is thermodynamically more favourable than oxidation of Sulphur to Sulphur dioxide – true or false?

1. True
2. False

Q. The correct sequence of decreasing number of $\pi$-bonds in the structures of $H_{2}S{O}_3,H_{2}S{O}_{4}and{H}_2{S}_2{O}_7$ is:

Q. Which is correct regarding the cyclic trimer of $S{O}_3$.

1. It contains three $S-S,\sigma$ bonds
2. It contains three $O-O,\sigma$ - bonds
3. It contains five $S-O,\pi$ bonds
4. The total no. of $\sigma$ and $\pi$ bonds in it are twelve and six respectively

Q. Purest form of Solid Sulphur trioxide exists as:

1. Dimer
2. Trimer
3. Both a and b
4. None of these