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12079

P.T.O.

21112

3 Hours / 100 Marks Seat No.

Instructions : (1) All Questions are compulsory.

(2) Answer each next main Question on a new page.

(3) Illustrate your answers with neat sketches wherever necessary.

(4) Figures to the right indicate full marks.

(5) Mobile Phone, Pager and any other Electronic Communication

devices are not permissible in Examination Hall.

Marks

1. Attempt any TEN of the following : 20

(a) Give advantage (only one) of DCDA process over conventional process

in connection with air pollution.

(b) Name two methods of separation of azeotropic mixture of nitric acid.

(c) Differentiate red phosphorus and yellow phosphorus in terms of their

reactivity.

(d) Give industrial applications of ammonia.

(e) Differentiate brine solution used for electrolysis in diaphragm cell and

mercury cell.

(f) Give chemical reaction involved in the manufacture of superphosphate.

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(g) What are mixed fertilizer ? What do you mean by 10 : 20 : 20 ?

(h) Write formula for biuret. Name a biuret component.

(i) State industrial uses of soda ash.

(j) Define portland cement.

(k) Write down temperature ranges in four zones of catalytic reactor of

DCDA process for sulphuric acid manufacturing.

(l) Write two industrial applications of acetylene.

2. Attempt any TWO of the following : 16

(a) Draw a neat flow diagram and describe contact process for H2SO4

manufacture.

(b) Describe the process for manufacture of caustic soda.

(c) Describe principle of Le Chatteliers on following parameters in the

manufacture of ammonia :

(i) Pressure

(ii) Temperature

(iii) Catalyst

(iv) Concentration of catalyst

3. Attempt any FOUR of the following : 16

(a) Describe manufacturing process of hydrochloric acid.

(b) Draw a flow diagram for phosphorus trichloride manufacturing.

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(c) Why are mixed fertilizers more popular now-a-days.

(d) Give significance of C2S, C3S, C3A, C4AF in cement.

(e) Write down materials and chemical reactions involved in the

manufacture of phosphoric acid by sulphuric acid leaching.

(f) Draw a flow diagram and write chemical reactions involved in the

manufacture of producer gas.

4. Attempt any TWO of the following : 16

(a) Draw a well labelled flow diagram for manufacture of urea, indicating

chemical reactions and raw materials involved.

(b) Draw a flow diagram for manufacture of red phosphorus and phosphoric

acid from phosphate rock.

(c) Draw Linde process for the manufacture of oxygen and nitrogen.

5. Attempt any TWO : 16

(a) Draw a neat flow diagram for Solvays process for sodaash,

manufacture.

(b) (i) Define single-super phosphate, triple-super phosphate.

(ii) How are super phosphates related with fertility of soil ?

(iii) Write reactions involved in pollution control of single-super

phosphate.

(c) Describe a process for manufacture of acetylene from calcium carbide.

Draw the flow diagram for the process.

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6. Attempt any FOUR of the following : 16

(a) What is gypsum ? Explain its role in cement industry.

(b) Describe only the process for manufacture of carbondioxide by

fermentation.

(c) Compare wet-and-dry-process of cement manufacture.

(d) Write cell reactions involved in diaphragm cell during electrolysis of

brine solution.

(e) Describe a process of concentration of nitric acid.

(f) Describe manufacturing process of hydrogen from natural gas.

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