Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is

Low pressure Zeigler process of polythene manufacture

A

Employs a pressure of 30 kgf/cm²

B

Achieves an yield of 95 - 98% based on ethylene

C

Produces very low density polythene

D

Does not use any catalyst for polymerisation

Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is

A

7 kgf/cm² and 70°C

B

1000 kgf/cm² and 100°C

C

7 kgf/cm² and 700°C

D

1 kgf/cm² (gage) and 70°C

Low density polythene as compared to high density polythene is

A

Harder

B

Tougher

C

Chemically inert

D

More flexible

Catalyst used in the production of high density polythene by low pressure Ziegler process is

A

Aluminium triethyl activated with TiCl₄

B

Platinum

C

Molybdenum

D

Nickel

Polythene (low or high density) containers are not corroded by

A

Sulphuric acid (10%) at room temperature

B

Nitric acid (95%) at room temperature

C

Sulphur trioxide at 60°C

D

Any of these

Density of low density polythene is about __________ gm/c.c.

A

0.38

B

0.56

C

0.81

D

0.91

In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.

A

Equal to

B

Less than

C

More than

D

None of these

Manufacture of phthalic anhydride uses __________ as a catalyst.

A

Ni

B

Cr

C

V₂O₅

D

Al₂O₃

Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process?

A

NH₃

B

NaCl

C

CaO

D

Coke

Platinum catalyst used in the earlier days of sulphuric acid manufacture by contact process suffers from the drawback like

A

High cost

B

Fragile nature

C

Easy poisoning tendency

D

All of the above

Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is

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