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Current Affairs January 2024

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4

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

A. Phosphates

B. Chromates

C. Sulphates

D. Bi-carbonates

Correct Answer :

B. Chromates


Related Questions

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4

Dacron (or Terylene) fibres as compared to nylon fibres have

A. Better heat & acid resistant properties

B. Poorer resistance to alkalis

C. Poorer dyeability

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

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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

Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction?

A. Oxidation of Na+ ions

B. Oxidation of Cl- ions

C. Reduction of Na+ ions

D. Reduction of Cl- ions

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4

Concentration of sulphide ores is done usually by

A. Roasting

B. Smelting

C. Froth floatation

D. Electromagnetic separation

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4

Polyvinyl chloride (PVC) is

A. A thermosetting material

B. A condensation polymerisation product

C. Made by employing emulsion polymerisation

D. None of these

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4

Coal tar is used as a

A. Binding material for coal briquettes

B. Fuel in rotary kiln

C. Binder in making carbon electrodes

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

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4

Salt cake is chemically represented by

A. Na2SO4

B. CaSO4. ½H2O

C. MgSO4

D. BaSO4

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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

Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

A. Its calorific value is very less

B. Tar neutralises the residual acids present in pitch

C. It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop

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

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4

Which of the following processes is absent in glass manufacturing process?

A. Sintering

B. Annealing

C. Shaping or forming

D. Melting

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4

Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine?

A. Na2CO3

B. NaHCO3

C. H2

D. None of these

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4

Digestion of wood-base materials (for manufacture of pulp) is done to

A. Remove lignin

B. Produce long fibres

C. Prevent deterioration on storage

D. None of these

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4

Which of the following is the main constituent of the mother liquor produced in salt industry?

A. Quick lime

B. Glauber's salt

C. Salt petre

D. Bromine

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4

Permanent hardness of water is due to the presence of calcium & magnesium

A. Bi-carbonates

B. Sulphates & chlorides

C. Carbonate

D. None of these

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4

__________ are added in lacquers to remove film brittleness and to improve adhereness.

A. Film forming materials

B. Plasticisers

C. Diluents

D. Solvents

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4

Favourable conditions for the liquefaction of gases in general are

A. High pressure & low temperature

B. Low pressure & high temperature

C. High pressure & high temperature

D. Low pressure & low temperature

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4

Chemical formula of oleum is

A. H2SO3

B. H2SO4

C. H2S2O7

D. H2SO7

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4

Carbon disulphide is mainly used in the production of

A. Viscose rayon

B. Corundum

C. Plasticiser for unsaturated polyester

D. Paints

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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

Sudden temperature fluctuation does not affect pyrex glass, because of its

A. Low co-efficient of expansion

B. High co-efficient of expansion

C. High melting point

D. Both (B) and (C)

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4

An alkali metal salt of Palmitic acid is known as

A. Soap

B. Metallic soap

C. Detergent

D. Alkaloid

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4

All enzymes are made of

A. Fats

B. Carbohydrates

C. Proteins

D. Amino acids

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4

Which of the following fuel gases contains maximum amount of carbon monoxide?

A. Coke oven gas

B. Water gas

C. Blast furnace gas

D. L.D. converter gas

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4

Flux addition during smelting of ore is done to

A. Remove impurities/gangue

B. Enhance rate of reaction

C. Accelerate reduction of ore

D. Separate slag from metal

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4

Dehydrogenation of Isopropanol produces

A. Propyl alcohol

B. Acetone

C. Trichloroethylene

D. Formaldehyde

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4

Zeolite used in water softening process (cation exchange) is regenerated by washing with

A. Brine

B. Chloramines

C. Sodium bisulphite

D. Liquid chlorines

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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

Enamels

A. Give good glossy finish

B. Are same as varnish

C. Are prepared from non-drying oil

D. Do not contain pigment

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4

Triple superphosphate is manufactured by reacting

A. Phosphate rock with phosphoric acid

B. Phosphate rock with sulphuric acid

C. Phosphate rock with nitric acid

D. Ammonium phosphate with phosphoric acid

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4

Rancidity of the fatty oil can be reduced by its

A. Decoloration

B. Hydrogenation

C. Oxidation

D. Purification