Revision Notes for ICSE Class 10 Chemistry Chapter 11 - Free PDF Download
FAQs on ICSE Class 10 Chemistry Revision Notes Chapter 11 - Sulphuric Acid
1. Why does sulphur dioxide need to get purified before entering the contact tower?
Sulphur dioxide produces certain impurities like vapours, arsenous oxide, dust, particles or pyrite dust, and arsenious oxide and these would lead to deactivation of the catalyst and therefore reduce its efficiency and therefore it is indispensable to purify it to avoid the poisoning of the catalyst which leads to the destruction of the activity of the catalyst and reduces its efficiency. In this whole process, the presence of gas is washed away with the help of water and then gets dried with sulphuric acid.
2. What are the properties of Sulphuric acid?
Sulphuric acid has many properties and they are as follows:
a. It is known as the king of chemicals because of its application in large no. of purposes.
b. It has a molecular formula of H2SO4.
c. Act as a strong protonating agent and oxidising agent.
d. It is also applied as a dehydrating agent and it is used to remove the molecule of water from many organic compounds.
e. It is a dibasic acid because of the presence of two hydrogen atoms.
3. What are its uses?
The uses of sulphuric acid are many which have been mentioned below:
It is popular as the king of chemicals.
It helps in the manufacturing of fertilisers like ammonium sulphate and superphosphate.
It is applied in the making of paint, dyes, and explosives like TNT.
It acts as a pickling agent and in labs as a dehydrating and oxidising agent.
It helps in the refining of petroleum.
It helps in the removal of impurities.
It helps in the cleaning of metals.
4. Describe the following terms:
a. Oleum
b. Dehydrating agent
c. Constant boiling mixture
a. Oleum is known as pyrosulphuric acid and has a formula of H2S2O7. Oleum helps in the transferring of sulphuric acid compounds. It has a high enthalpy of hydration which helps in the manufacturing of sulphuric acid.
b. Dehydrating agent is a compound with a mere affinity for water. It helps in removing the atoms of hydrogen and oxygen in the form of water from a substance.
c. The mixture boils constantly and there is no change in its composition.
5. Why is sulphuric acid known as the king of chemicals and oil vitriol?
Sulphuric acid is known as the king of chemicals because of its extensive use in most industries directly or indirectly. It is produced from the green vitriol FeSO4·7H2O in the 8th century. The appearance of vitriol is oily and therefore it is known as oil of green vitriol and it is present in vitreous and glassy substances, for example, ferrous sulphate, etc. Supluric has many applications which are used in the manufacturing of fertilisers, paint, dyes, explosives and in labs as a dehydrating and oxidising agent, etc.
