The process employed in the industrial preparation of tetraoxosulphate(VI) acid is

1. Analyze the Question

The question asks for the specific industrial process used to manufacture tetraoxosulphate(VI) acid, which is commonly known as Sulphuric acid ($H_2SO_4$).

2. Explain the Concept

Industrial chemistry involves specific named processes for the large-scale production of chemicals. To answer this, we must identify the purpose of each process listed in the options:

• Contact Process: This is the standard industrial method for the production of concentrated sulphuric acid. It involves the catalytic oxidation of sulphur(IV) oxide to sulphur(VI) oxide, which is then absorbed in concentrated sulphuric acid to form oleum, followed by dilution.
• Bosch Process: This is used for the production of hydrogen gas by the reaction of steam with water gas (a mixture of carbon(II) oxide and hydrogen).
• Frasch Process: This is the method used for the extraction of elemental sulphur from underground deposits, not for the production of the acid itself.
• Haber Process: This is the industrial process for the manufacture of ammonia ($NH_3$) from nitrogen and hydrogen gases.

3. Show the Solution

• Step 1: Identify the chemical: Tetraoxosulphate(VI) acid is $H_2SO_4$.
• Step 2: Evaluate the options based on their industrial application.
• Step 3: Since the Contact Process is specifically designed to convert sulphur dioxide into sulphur trioxide and subsequently into sulphuric acid, it is the correct industrial method.

4. Identify the Answer

The correct option is A.

5. Exam Tip

To avoid confusion in the exam hall, remember these "Big Four" industrial processes:

• Contact = Sulphuric Acid ($H_2SO_4$)
• Haber = Ammonia ($NH_3$)
• Ostwald = Nitric Acid ($HNO_3$)
• Solvay = Sodium Trioxocarbonate(IV) ($Na_2CO_3$)