Sulphur Trioxide

Q.

What is the structure of ${\mathrm{XeOF}}_4$ ?

Q. Which out of $N{H}_3$ and $N{F}_3$ has higher dipole moment and why?

Q.

The number of S–S bonds in sulphur trioxide trimer is:

1. Zero

2. One

3. Two

4. Three

Q. Assertion :Formal charges help in selection of the lowest energy structure from a number of possible lewis structure. Reason: show $+1$ formal charge on central O marked 1.

1. Both Assertion and Reason are true and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are true but Reason is not the correct explanation for Assertion
3. Assertion is true statement but Reason is false
4. Both Assertion and Reason are false statement.,

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.

In the contact process, $S{O}_3$ is dissolved in concentrated Sulphuric acid to produce:

1. Fuming Sulphuric acid

2. Pyrosulphuric acid

3. Oleum

4. $H_2{S}_2{O}_7$

Q. Assertion :Potassium and sodium react with water. Reason: Both $Na$ and $K$ liberate $H_2$ on reacting with water.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Moist $S{O}_2$ behaves as a __ agent.

Q. In the gaseous phase, the sigma O – S – O bond angle in the $S{O}_3$ molecule is degrees.

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.

The first step in the manufacture of nitric acid is the catalytic oxidation of ammonia. What is the name of the catalyst?

Q.

Concentrated nitric acid oxidizes phosphorus to phosphoric acid according to the following equations :

$\mathrm{P}+5{\mathrm{HNO}}_3{\left(\mathrm{CONC}.\right)}_{\to }{\mathrm{H}}_3{\mathrm{PO}}_4+{\mathrm{H}}_2\mathrm{O}+5{\mathrm{NO}}_2$

If 9.3g of phosphorus was used in the reactions, calculate: The volume of nitrogen dioxide produced at STP.

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.

Concentrated nitric acid oxidizes phosphorus to phosphoric acid according to the following equations :

$\mathrm{P}+5{\mathrm{HNO}}_3{\left(\mathrm{CONC}.\right)}_{\to }{\mathrm{H}}_3{\mathrm{PO}}_4+{\mathrm{H}}_2\mathrm{O}+5{\mathrm{NO}}_2$

If 9.3g of phosphorus was used in the reactions, calculate: The volume of nitrogen dioxide produced at STP.