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Current Affairs January 2024

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4

Roasting of metallurgical ores is done mainly to

A. Dehydrate it

B. Sinter the ore

C. Remove CO2 & H2O

D. Remove arsenic & sulphur

Correct Answer :

D. Remove arsenic & sulphur


Related Questions

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Catalytic oxidation-dehydrogenation of methyl alcohol produces

A. Formaldehyde

B. Phenol

C. Acetone

D. Maleic anhydride

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4

Catalyst used during the manufacture of 'Vanaspati Ghee' is

A. Zinc

B. Nickel

C. Platinum

D. Copper

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4

Pick out the wrong statement.

A. Pasteurisation of milk involves moderate heating followed by cooling

B. Bakeries and breweries make use of yeasts

C. Enzyme is a complex nitrogenous compound

D. Oils and fats are alkaloids

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4

Phthalic anhydride is produced by the oxidation of

A. Naphthalene

B. Benzene

C. Toluene

D. Aniline

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4

Main use of hydrazine is

A. As a rocket fuel

B. In water treatment

C. As a disinfectant

D. As fire retardant

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4

Most widely and commonly used coagulant for the removal of suspended impurities in water is

A. Bleaching powder

B. Slaked lime

C. Alum

D. Copper sulphate

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4

Detergent is produced by the sulphonation of dodecyl benzene, which is an __________ reaction.

A. Endothermic

B. Exothermic

C. Irreversible

D. Both (B) and (C)

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4

Poly Vinyl Chloride (P.V.C.) is a __________ material.

A. Thermosetting

B. Thermoplastic

C. Fibrous

D. Chemically active

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4

Solvay process is used for the manufacture of

A. Caustic soda

B. Soda ash

C. Caustic potash

D. Soda lime

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4

Type of glass used in optical work is the __________ glass.

A. Soda-lime

B. Fibre

C. Lead

D. Borosilicate

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4

Heating of __________ to 120°C, produces plaster of paris.

A. Blue vitriol

B. Gypsum

C. Calcium silicate

D. Calcium sulphate

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4

Salt is added in the kettle during soap manufacture to separate

A. Soap from lye

B. Glycerine from lye

C. The metallic soap

D. The unsaponified fat from soap

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4

Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.

A. Chromium

B. Arsenic

C. Copper

D. Manganese

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4

Sizing material is incorporated in paper to

A. Impart resistance to penetration by liquids

B. Increase its thickness

C. Increase its flexibility & opacity

D. Increase its brightness

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4

Stereospecific agents are exemplified by

A. Radiation

B. Supported metal oxide catalysts

C. Ziegler catalysts

D. All (A), (B) & (C)

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4

99.5% purity oxygen is used in

A. Cutting and welding by oxy-acetylene flame

B. Hospitals for medicinal purposes

C. Gas masks and artificial breathing apparatus

D. All (A), (B), and (C)

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4

A good quality coal should have

A. Low fusion point of ash

B. High ash content

C. High sulphur content

D. None of these

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4

Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.

A. -83

B. -183

C. -196

D. -218

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4

Commercial production of Vanaspati is done by __________ of edible vegetable oils.

A. Hydrogenation

B. Oxidation

C. Hydrolysis

D. Hydrocracking

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4

Presence of carbonaceous matter in the sewage

A. Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures

B. Reduces sulphate ions to sulphides causing obnoxious smell

C. Increases the quantity of chlorine used for its purification

D. All (A), (B) and (C)

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4

Fusion of limestone and __________ produces high alumina cement.

A. Sand

B. Bauxite

C. Quicklime

D. Calcite

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4

RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically

A. Cyclo trimethylene trinitramine

B. Trinitro resorcinol

C. Cyclo tetramethylene tetranitramine

D. Trinitrobenzene

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4

Very fine suspended and colloidal impurities are removed from water by a process called

A. Sedimentation

B. Coagulation

C. Disinfection

D. Softening

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4

The most stable allotropic form of phosphorous is the __________ phosphorous.

A. White

B. Black

C. Yellow

D. Red

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4

CaSO4 . ½H2O is known as

A. Blue vitriol

B. Plaster of Paris

C. Gypsum

D. Zeolite

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4

Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo?

A. Depithing

B. Digestion

C. Bleaching

D. None of these

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4

Lime and soda ash are added to water to remove

A. Bicarbonates & sulphates of calcium and magnesium

B. Undesirable taste and odour

C. Bacteria

D. Its corrosiveness

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4

Blue vitriol is chemically

A. Copper sulphate

B. Ferrous sulphate

C. Copper nitrate

D. Aluminium sulphate

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4

Calcination of gypsum produces

A. Plaster of Paris

B. Salt cake

C. Nitre cake

D. Lime

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4

Pick out the wrong statement.

A. Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80%

B. Contact process of sulphuric acid manufacture produces pure acid of concentration ≥ 98%

C. 75% oleum can be produced by distillation of 20% oleum

D. Contact process of sulphuric acid manufacture uses nickel as the catalyst