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Current Affairs January 2024

What is the correct answer?

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

Correct Answer :

A. Bicarbonates & sulphates of calcium and magnesium


Related Questions

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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

Which of the following is not produced commercially from sea water?

A. Magnesium & potassium compounds

B. Common salt

C. Bromine

D. Iodine

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4

Pick out the wrong statement pertaining to the soap manufacture.

A. Transparent soaps are made by cold process

B. Organic pigments are used as colouring materials in the soap manufacture

C. Both laundry as well as toilet soaps are manufactured by hot process

D. Colourless rosin is used in the manufacture of laundry soaps

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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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4

Pick out the wrong statement.

A. Conversion of SO2 to SO3 in Monsanto-4 pass converter is about 98%

B. The chemical formula of oleum is H2S2O7, which is formed by saturating sulphuric acid with sulphur trioxide

C. Vitriol oil is nothing but technical sulphuric acid

D. Decomposition of sulphuric acid on heating does not start before its boiling

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4

Which of the following is the second major component of cement?

A. Al2O3

B. CaO

C. SiO2

D. Fe2O3

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4

The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to

A. Avoid mechanical weakening of fibre

B. Remove lignin by way of crystallisation

C. Increase the cellulose content

D. None of these

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4

Main constituents of natural rubber is

A. Polystyrene

B. Polyisoprene

C. Polybutadiene

D. Polychlorophrene

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4

The gasification reaction represented by, C + H2O = CO + H2, is a/an __________ reaction.

A. Exothermic

B. Endothermic

C. Catalytic

D. Autocatalytic

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4

In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 2SO3), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by

A. Increasing the oxygen concentration

B. Putting more quantity of V2O5 catalyst in the converter

C. Removing some quantity of SO3 during intermediate stage

D. Maintaining low temperature & pressure in the converter

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4

Pure rectified spirit contains about __________ percent alcohol.

A. 45

B. 70

C. 95

D. 99.5

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4

Starting material for the production of butadiene in India is

A. Naphthalene

B. Benzol

C. Ethyl alcohol

D. Phthalic anhydride

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4

The drug used in contraceptives is

A. Sulfadiazine

B. Mestranol

C. Methyl salicylate

D. Penicillin

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4

Metallic soap is __________ salt of fatty acids.

A. Sodium

B. Potassium

C. Both sodium & potassium

D. Aluminium or calcium

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4

Nylon-66 is manufactured from

A. Hexamethylene diamine and adipic acid

B. Hexamethylene diamine and Maleic anhydride

C. Caprolactam

D. Dimethyl terephthalate and ethylene glycol

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4

Sea water contains about __________ ppm of bromine.

A. 5

B. 70

C. 500

D. 1700

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4

Deacon's method is used for the manufacture of

A. Glauber's salt

B. Common salt

C. Chlorine

D. Graphite electrode

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4

The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by

A. Electrolysis

B. Electrolytic reduction

C. Electrolytic oxidation

D. None of these

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4

Pick out the wrong statement pertaining to nitric acid.

A. About 90% of nitric acid is manufactured by Ostwald's process

B. It is a strong mono basic acid which reacts with almost all the metals except noble metals

C. Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO2)

D. Arc process of nitric acid manufacture is economical as compared to Ostwald's process

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4

__________ is used as a flux in the extraction of iron from iron ore (haematite) in blast furnace.

A. Bauxite

B. Limestone

C. Quartz

D. Manganese

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4

Which of the following processes can remove both temporary as well as permanent hardness of water?

A. Filtration

B. Boiling

C. Distillation

D. None of these

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4

Production of alcohol by fermentation of molasses is a/an __________ process.

A. Anaerobic

B. Aerobic

C. Endothermic

D. Both (B) and (C)

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4

Sugar content in sugarcane on cane basis is about __________ percent by weight.

A. 1 to 5

B. 5 to 10

C. 15 to 20

D. 20 to 30

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4

Dehydrogenation of ethyl benzene produces

A. Styrene

B. Naphthalene

C. Phenol

D. Benzoic acid

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4

Which of the following is a disaccharide?

A. Sucrose

B. Glucose

C. Starch

D. Maltose

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4

Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate

A. Is prone to thermal decomposition

B. Has high water solubility and is unstable

C. Is soluble in ammonium chloride and potassium chloride solution

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

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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

Nylon-6 is a

A. Polyamide

B. Thermosetting resin

C. Polyester

D. None of these

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4

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

A. Nickel

B. Vanadium

C. Alumina

D. Iron

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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