ICSE Class 10 Chemistry Case Study based questions – Study of Compounds D. Sulphuric Acid
On this page we have given ICSE Class 10 Chemistry Chapter 11 Case Study based questions – Study of Compounds D. Sulphuric Acid. From 2024 Board exam, ICSE will focus on Technical Based, Analytical Based and Critical Questions in Chemistry Exam. So we Net Ex, has started giving Case Study based questions which is also known as Paragraph Based Questions.
Que No. 1 –
Manufacture of sulphuric acid (Contact process)
The various steps in the Contact process are as follows:
(1) Production of Sulphur dioxide
(2) Purification of gases
(3) Catalytic oxidation of Sulphur dioxide
(4) Absorption of Sulphur trioxide in sulphuric acid
(5) Dilution of oleum to obtain sulphuric acid.
What is the role of vanadium pentoxide or platinum in contact process ?
State what is the role of the following :
1) Dusting chamber
2) Sulphur or iron pyrite burners
3) Cooling pipes
In which step oleum or pyrosulphuric acid is formed and write the chemical reaction for the formation of oleum or pyrosulphuric acid.
Que No. 2 –
Addition of conc. H2SO4 to sugar’
Refer above figure and answer the following questions
1.) Write the reaction of sulphuric acid with cane sugar.
2.) What is the black spongy carbon mass called ?
3.) Mention the other two carbohydrates which undergo the same reaction with Conc. sulphuric acid.
Que No. 3 –
1.) BaCl2 + H2SO4→ BaSO4 + 2HCI
2.) BaCl2+MgSO4 → BaSO4 + MgCl₂
Refer the above reactions and answer the following questions.
1.) Among the two products formed in 1st reaction which product is formed in the form of precipitate .
2.) What is the colour of precipitate formed in both reactions ?
3.) Give any one difference between barium sulphate and barium sulphite in terms of solubility.
Que No. 1 Answers-
1.) The clean dried gaseous mixture of Sulphur dioxide and air is passed through contact tower loosely packed with vanadium pentoxide or platinum on perforated shelves. The catalyst is placed in vertical iron pipes inside a cylindrical iron tower called the converter. Here, the preheated mixture of Sulphur dioxide and air (oxygen) on passing through catalyst pipes forms Sulphur trioxide.
2.) The role of :
1) Dusting chamber – For removal of dust particles by downward blow of steam.
2) Sulphur or iron pyrite burners – For production of Sulphur dioxide by burning Sulphur or iron pyrites.
3) Cooling pipes – For cooling the gases by passage through isolated pipes.
3.) Oleum or pyrosulphuric acid is formed in 4th step that is Absorption of Sulphur trioxide in sulphuric acid .
Reaction of formation of oleum –
SO3 + H2SO4 → H₂S2O7
Que No. 2 Answers-
1.) C12H22O11 + Conc. H2SO4→ 12C + 11H2O
2.) Carbon obtained in this reaction is very pure and is called sugar charcoal.
3.) Glucose, and sugar, and cellulose (paper, cotton, wood, etc.) are the examples of carbohydrates which undergo the same reaction.
Que No. 3 Answers-
1.) Barium sulphate is formed in the form of precipitate.
2.) The colour of the precipitate (barium sulphate) is White.
3.) Precipitates of both barium sulphate and barium sulphite are white in colour but barium sulphite precipitate dissolves in mineral acids while barium sulphate precipitate does not.