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Current Affairs January 2024

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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

Correct Answer :

C. Alum


Related Questions

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Thorium is mainly used

A. For the manufacture of gas mantles

B. As a fissile fuel in a nuclear reactor

C. In the manufacture of hydrogen bomb

D. In the treatment of cancer

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4

Chemical name of soda ash is

A. Sodium bicarbonate

B. Sodium thiosulphate

C. Potassium carbonate

D. None of these

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Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent.

A. 75

B. < 10

C. > 30

D. 50

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4

Which of the following is a bleaching agent added in the detergents to facilitate removal of stains caused due to blood, tea etc?

A. Sodium silicate

B. Sodium borate

C. Sodium tripolyphosphate (STPP)

D. Caustic soda

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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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Pick out the wrong statement.

A. Fibrillation of fibre during paper manufacture is done to develop the strength in paper

B. Alkali consumption in digestion/cooking of bamboo is measured in terms of permanganate number

C. Bagasse fibre contains both lignin & cellulose

D. Presence of sodium sulphate in pulp makes the pulp bleachability poor

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4

20% oleum means that in 100 kg oleum, there are 20 kg of

A. SO3 and 80kg of H2SO4

B. H2SO4 and 80kg of SO3

C. SO3 for each 100 kg of H2SO4

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

Oils and fats are converted to soap in a process called

A. Hydrogenation

B. Esterification

C. Saponification

D. None of these

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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

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__________ is a thermosetting plastic.

A. Polythene

B. Epoxy polymer

C. P.V.C.

D. Polystyrene

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__________ are used as corrosion inhibitor for iron & steel in aqueous solutions.

A. Phosphates

B. Chromates

C. Sulphates

D. Bi-carbonates

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Cement mainly contains

A. CaO, SiO2, Al2O3

B. MgO, SiO2, K2O

C. Al2O3, MgO, Fe2O3

D. CaO, MgO, K2O

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4

Sucrose content in cane sugar may be around __________ percent.

A. 50

B. 70

C. 95

D. 80

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Hydrocyanic acid (HCN) is used as an insecticide for

A. Controlling timber degradation by ants

B. Controlling poultry lice

C. Potato beetle

D. Citrus fruits

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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

Low purity oxygen is used for

A. L.D. steel making

B. Cutting and welding of metals

C. Medicinal purposes

D. Chemical oxidation processes

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4

Helium is produced on commercial scale from

A. Air

B. Natural gas

C. Coke oven gas

D. None of these

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4

Carboxymethyl cellulose (CMC) is added in detergents to act as a/an

A. Surfactant

B. Builder

C. Optical brightening agent

D. Anti soil redeposition agent

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4

Vanillin is a type of

A. Anti-pyretic drug

B. Food preservative

C. Flavour

D. Dye

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Carbon tetrachloride (CCl4) is the starting raw material for the manufacture of

A. Trichloroethylene

B. Perchloroethylene

C. Parathion

D. Methanol

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4

Chloral is used in the manufacture of

A. DDT

B. BHC

C. Parathion

D. None of these

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Salt cake is chemically represented by

A. Na2SO4

B. CaSO4. ½H2O

C. MgSO4

D. BaSO4

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Nylon-6 is a

A. Polyamide

B. Thermosetting resin

C. Polyester

D. None of these

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4

Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture.

A. CaO

B. MnO2

C. ZnO

D. FeS

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4

Lubricating greases are a mixture of

A. Mineral oil, soap and additives

B. Mineral oil and metallic soap

C. Mineral oil and fatty oil

D. Fatty oil and metallic soap

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4

Styrene-butadiene-rubber (SBR) as compared to natural rubber has

A. Poorer tensile strength

B. Poorer resistance to oxidation

C. Greater amount of heat build-up under heavy loading

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

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4

Cooking liquor in case of sulphite process is

A. Sodium sulphite and sodium bisulphite

B. Magnesium sulphite and free SO2 in acid medium

C. Magnesium sulphate and magnesium bicarbonate

D. None of these

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4

Fat splitting catalyst is

A. CaCO3

B. ZnO

C. Al2O3

D. Fe

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Ore concentration by froth floatation utilises the __________ of ore particles.

A. Density difference

B. Wetting characteristics

C. Terminal velocities

D. None of these