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Question

Write chemical reactions for different steps in the manufacture of sulphuric acid by lead chamber process. Draw the structure of phosphorus pentachloride.

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Solution

Structure of $P C l_{5}$

Lead chamber process
1) First $S O_{2}$ is formed
$S + O_{2} \to S O_{2}$
OR
$F e S_{2} + O_{2} \to F e_{2} O_{3} + S O_{2}$
2) $H_{2} S O_{4}$ is obtained by oxidation of $S O_{2}$ in presence of $N O$ as a catalyst.
$S O_{2} + H_{2} O + [O] N O - - \to H_{2} S O_{4}$

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Q. What is the catalyst used for oxidation of

S O_{2}

S O_{3}

in lead chamber process for manufacture of sulphuric acid?

Q. (i) How is nitric acid manufactured by Ostwald process ?
(ii) Write down the reaction of Ozone with black lead sulphide.
(iii) Draw a structure of

1 F_{7}

Compounds of nitrogen, phosphorus and sulphur such as ammonia, phosphoric acid and sulphuric acid are used in fertiliser industry.

Describe contact process for the manufacture of sulphuric acid?

Q. Give chemical equations to manufacture of Sulphuric Acid by Contact process.

Q. (a) Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.
(b) In the Contact process for the manufacture of the sulphuric acid, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead, a two-steps procedure is used. Write the equations for the two steps involved in D.
(c) What type of substance will liberate sulphur dioxide from sodium sulphite to step E?
(d) Write the equation for the reaction by which sulphur dioxide is converted to sodium sulphite in step F.
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