Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.

Manufacture of phthalic anhydride uses __________ as a catalyst.

A

Ni

B

Cr

C

V₂O₅

D

Al₂O₃

Phthalic anhydride is produced by the oxidation of

A

Naphthalene

B

Benzene

C

Toluene

D

Aniline

Catalyst used in the oxidation of benzene to produce maleic anhydride is

A

V₂O₅

B

Pt

C

Ni

D

Cr

Molten phthalic anhydride is stored in a/an __________ vessel.

A

Aluminium

B

Nickel clad steel

C

Lead lined steel

D

Glass lined steel

__________ are produced by reacting polybasic acid (e.g. phthalic anhydride) with polyhydric alcohol (e.g., glycerol).

A

Unsaturated polyester

B

Alkyd resins

C

Saturated polyester

D

Amino resins

Phthalic anhydride is made by the

A

Oxidation of naphthalene

B

Oxidation of benzene

C

Dehydrogenation of ethyl benzene

D

None of these

Phthalic anhydride is used

A

In making PVC

B

As plasticisers

C

In insecticides manufacture

D

For making nylon-6

Alkyd resin e.g., glyptal resin formed by phthalic anhydride and glycerene is not used

A

For surface coating of automobiles & air crafts

B

For fibre making

C

As plasticiser for PVC & nitrocellulose

D

For film forming materials

Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

A

Coagulation and flocculation of colloids

B

Oxidation of carbonaceous matter to CO₂

C

Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate

D

All of the above

Maleic anhydride is produced by catalytic oxidation of

A

Toluene

B

Ethyl alcohol

C

Naphthalene

D

Benzene

Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.

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