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Current Affairs January 2024

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4

During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as

A. It is very corrosive at elevated temperature

B. Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)

C. It decomposes on further increasing the temperature

D. None of these

Correct Answer :

B. Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)


Related Questions

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Chemical name of soda ash is

A. Sodium bicarbonate

B. Sodium thiosulphate

C. Potassium carbonate

D. None of these

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4

The process involved in converting rubber into a thin sheet or coating it on fabric is called

A. Extrusion

B. Mastication

C. Calendaring

D. Vulcanisation

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4

Linde process of gas liquefaction employs

A. Exchange of heat with colder stream

B. Adiabatic expansion through a throttle valve (Joule-Thomson expansion)

C. Adiabatic expansion against a piston or in a turbine

D. Merely compressing the gas beyond its critical pressure

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4

Reaction of calcium carbide with water produces a gas, which is used

A. As an illuminant

B. For metal cutting/welding

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

Which of the following is an yellow pigment?

A. Titanium dioxide

B. Ferrous sulphate

C. Lead chromates

D. Zinc sulphides

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4

Which of the following is used as a coagulant in water treatment?

A. Chloramine

B. Chlorine

C. Ferrous sulphate

D. Hydrogen peroxide

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4

Proximate analysis of coal determines its __________ content.

A. Moisture, ash, sulphur & volatile matter

B. Moisture & volatile matter

C. Moisture, sulphur, nitrogen & fixed carbon

D. None of these

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4

Mannheim furnace is used in the manufacture of

A. Hydrochloric acid

B. H2SO4 by Chamber process

C. Calcium carbide

D. Corundum

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4

Cation exchanger is regenerated usually with

A. NaOH

B. H2SO4

C. Hydrazine

D. Alum solution

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4

Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.

A. Coke and sand

B. Brine and coal

C. Coke and caustic soda

D. None of these

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4

Pasteurisation of milk means

A. Removal of fatty and albuminous substance from it

B. Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics

C. Inhibiting the growth of micro-organisms without killing them

D. None of these

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4

Manufacture of phthalic anhydride uses __________ as a catalyst.

A. Ni

B. Cr

C. V2O5

D. Al2O3

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4

Kaolin is a/an

A. Refractory material

B. Synthetic resin

C. Artificial abrasive

D. Blue pigment

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4

The end bleaching agent used to move last traces of colour bodies from the pulp is

A. Chlorine dioxide (ClO2)

B. MgO

C. SO2 gas

D. Mercaptans

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4

Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process.

A. Mechanical

B. Sulphate/Kraft

C. Sulphite

D. Neutral sulphite semi-chemical

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4

Esterification reaction produces

A. Detergent

B. Vanaspati

C. Soap

D. Mercaptans

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4

Which of the following is not a pyrite ore?

A. Celestite

B. Galena

C. Gypsum

D. Siderite

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4

Presence of H2S in raw water (to be chlorinated) results in the

A. Reduced softening capacity of zeolite

B. Increased dosage of chlorine to provide a disinfecting residual in the water

C. Easy removal of its hardness

D. None of these

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4

The main product of high temperature carbonisation of coal is

A. Coke

B. Ammonia

C. Tar

D. Phenol

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4

Transparent soaps (e.g. Pears) are

A. Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency

B. Metallic soaps with frothing agent and free Stearic acid to achieve transparency

C. Metallic soaps with frothing agent from which glycerine has not been recovered

D. None of these

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4

Catalytic oxidation of naphthalene produces

A. Styrene

B. Phenol

C. Phthalic anhydride

D. None of these

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4

Sulphur addition in soap is done to

A. Improve the soap texture

B. Cure pimples & dandruff

C. Fasten lather formation

D. Increase its cleansing action

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4

Vegetable oils and fats basically differ in their

A. Density ranges

B. Physical state

C. Chemical composition

D. Chemical properties

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Ca(OH)2 is called

A. Quicklime

B. Slaked lime

C. Limestone

D. Gypsum

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4

Main constituent of limestone is

A. CaCO3

B. MgCO3

C. Na2CO3

D. CaSO4

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4

Molecular weight of plastics ranges from

A. 5000 to 10000

B. 20000 to 250000

C. 500 to 5000

D. 106 to 109

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4

Widely used method for the conditioning of boiler feed water is the

A. Cold lime process

B. Coagulation

C. Hot-lime soda process

D. Sequestration

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4

Bromine content in sea water may be around __________ ppm.

A. 70

B. 640

C. 1875

D. 2500

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4

Gelatine which is a nitrogenous organic protein is obtained by the hydrolysis of

A. Collagen

B. Tannin

C. Molasses

D. Carbohydrate

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4

Percentage of uranium in Carnotite ore found in Jadugoda (Jharkhand) is about

A. 0.1 to 0.5

B. 1 to 5

C. 5 to 10

D. 15 to 25