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Current Affairs January 2024

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4

Solvent used for extraction of oil is

A. Hexane

B. Methyl ethyl ketone

C. Furfural

D. None of these

Correct Answer :

A. Hexane


Related Questions

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4

Molecular weights of polymers are in the range of

A. 102 - 102

B. 105 - 109

C. 102 - 107

D. 109 - 1011

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4

Gun powder uses

A. Sulphur

B. Charcoal

C. Potassium nitrate

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

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4

__________ is produced by the dehydrogenation of ethyl benzene.

A. Styrene

B. Ethyl alcohol

C. Cumene

D. Phenol

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4

Commercial production of calcium carbide requires limestone and __________ as raw materials.

A. Coke

B. Sand

C. Soda ash

D. Fuel oil

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4

Fourdrinier machine is used in the manufacture of

A. Nylon-6

B. Paper

C. Antibiotics

D. Sugar

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4

Yellow phosphorus is transported under

A. Air

B. Water

C. Nitrogen

D. Helium

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4

Hydrazine is used in water treatment for the removal of

A. Colloidal impurities

B. Dissolved oxygen

C. Turbidity

D. Chlorinous taste

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4

Hydrogenation of edible vegetable oils

A. Is an exothermic reaction

B. Increases their melting point

C. Is done in presence of nickel catalyst

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

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4

Grignard reagent is chemically known as

A. Ethyl magnesium chloride

B. Methyl magnesium chloride

C. Dichlorophenol

D. Monochloroacetic acid

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4

Saponification number of an oil or fat

A. Gives an idea about its molecular weight

B. Is inversely proportional to its molecular weight

C. Detects its adulteration

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

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4

Which of the following is not an insecticide?

A. Hydrocyanic acid

B. Nicotine

C. Sodium fluoride

D. Hexane

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4

Which of the following paper does not require a filler during manufacture?

A. Bond paper

B. Writing paper

C. Blotting paper

D. Coloured paper

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4

Shrinkage volume in cement setting does not depend upon the

A. Sand to cement ratio

B. Water to cement ratio

C. Ambient temperature fluctuation

D. Drying period

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4

Bromides contained in hot mother liquor is treated with __________ during manufacture of bromine from sea water.

A. SO3

B. Cl2

C. NH3

D. SO2

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4

The compressive strength of cement should not be less than about 110Kg/cm2 after three days & not less than 170Kg/cm2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm2/gm.

A. 800

B. 1600

C. 4000

D. 8500

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4

Varnish does not contain

A. Thinner

B. Pigment

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

Concentration of NaOH solution produced by diaphragm electrolytic cell is about __________ percent.

A. 10

B. 25

C. 50

D. 98

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4

In the manufacture of sulphuric acid from elemental sulphur, the following sequence of major operations is followed:

A. Furnace → converter → absorber

B. Furnace → evaporator → absorber

C. Furnace → converter → evaporator

D. Converter → furnace → absorber

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4

Dense soda ash used in the manufacture of glass, is chemically represented by

A. Na2CO3

B. Na2CO3.10H2O

C. Na2CO3.H2O

D. Na2HCO3

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4

__________ iron is the purest form of iron.

A. Cast

B. Wrought

C. Pig

D. High silicon

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4

Pick out the wrong statement.

A. Dry process is used for the manufacture of cement, when the raw material is blast furnace slag

B. Portland cement is made employing wet process

C. Gypsum is added to Portland cement to lengthen its setting time

D. None of these

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4

Which form of sulphur is the most stable at room temperature?

A. Plastic

B. Monoclinic

C. Rhombic

D. Flowers of sulphur

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4

Catalytic oxidation-dehydrogenation of methyl alcohol produces

A. Formaldehyde

B. Phenol

C. Acetone

D. Maleic anhydride

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4

Chalcopyrite is the main ore of

A. Copper

B. Lead

C. Tin

D. Iron

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4

Phosphate rock is a raw material for the manufacture of

A. Phosphoric acid

B. Phosphorous

C. Superphosphates

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

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4

Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about __________ °C.

A. -53

B. -103

C. -183

D. -196

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4

Raw materials used for producing __________ cement does not contain iron oxide.

A. Waterproof

B. Slag

C. White

D. Pozzolan

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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

Drinking (potable) water treatment does not involve

A. Coagulation

B. Sedimentation

C. Softening

D. Disinfection

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4

Neoprene is the trade name of

A. Polyurethane

B. Phenol formaldehyde

C. Polychlorophrene

D. Styrene-butadiene rubber