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Current Affairs January 2024

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Bleaching action of bleaching powder is due to its __________ properties.

A. Reducing

B. Oxidising

C. Disinfecting

D. None of these

Correct Answer :

B. Oxidising


Related Questions

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Extraction of __________ employs an electrolytic process.

A. Aluminium

B. Silver

C. Copper

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

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The major use of butadiene is

A. As a plasticiser for unsaturated polyester

B. In the manufacture of synthetic rubber

C. As an anti-skinning agent in paint

D. None of these

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Plaster of Paris is

A. CaSO4. ½H2O

B. Used for setting of broken bones

C. Both (A) and (B)

D. Same as gypsum

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Starting raw material for the manufacture of alum is

A. Alumina

B. Gypsum

C. Bauxite

D. Ammonium bicarbonate

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Phenol formaldehyde resin is used as an adhesive in making

A. Laminates

B. Card boxes

C. Furniture

D. Books

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In an integrated steel plant, NH3 present in coke oven gas is normally recovered as

A. (NH4)2SO4

B. NH4Cl

C. (NH4)2 NO3

D. Liquid NH3

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Oils are partially hydrogenated (not fully) to manufacture Vanaspati, because fully saturated solidified oils

A. Cause cholesterol build up and blood clotting

B. Are prone to rancid oxidation

C. Always contain some amount of nickel (as their complete removal is very difficult)

D. Have affinity to retain harmful sulphur compounds

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Calgon used in water treatment is chemically

A. Sodium phosphate

B. Sodium hexametaphosphate

C. Calcium phosphate

D. Tricresyl phosphate

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

A. 10

B. 25

C. 50

D. 98

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Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on

A. Slaked lime

B. Soda lime

C. Calcium perchlorate

D. None of these

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4

Main constituents of Portland cement are calcium aluminate and

A. Gypsum

B. Silicates

C. Sodium silicate

D. Carbonates

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Yeast is used in the manufacture of

A. Penicillin

B. Antibiotics

C. Wine

D. Pasteurised milk

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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

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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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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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Hydrazine is largely used

A. As a starting material for 'hypo'

B. In photographic industry

C. As rocket fuel

D. In printing industry

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Yellow glycerine is made into white, using

A. Activated carbon

B. Diatomaceous earth

C. Bauxite

D. Bentonite

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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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Paper pulp produced by Kraft/sulphate process is

A. Bleached easily

B. Dull white in color

C. Strong fibrous

D. Dark colored

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Pick out the wrong statement.

A. Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action

B. Soap powder is prepared by mixing soap with hydrated sodium carbonate

C. Detergents differ from soaps in their action in hard water

D. Tarnish inhibitor (e.g., Benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc

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Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials.

A. Adsorbs

B. Oxidises

C. Reduces

D. Converts

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Rosin soap is added during paper manufacture to

A. Impart adhesive properties

B. Improve opacity

C. Impart resistance to penetration by liquids

D. None of these

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Pick out the exothermic reaction out of the following:

A. C + H2O = CO + H2

B. CaC2 + H2O = Ca(OH)2 + C2H2

C. MgCO3 = MgO + CO2

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

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4

Highly porous refractory bricks are

A. Less susceptible to chemical attack by molten fluxes and gases etc

B. Very strong

C. Having very high thermal conductivity

D. None of these

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Very fine suspended and colloidal impurities are removed from water by a process called

A. Sedimentation

B. Coagulation

C. Disinfection

D. Softening

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Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain high amount of saturated fatty acids, it is termed as __________ oil.

A. Drying

B. Semi-drying

C. Non-drying

D. None of these

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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

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Salt cake is chemically represented by

A. Na2SO4

B. CaSO4. ½H2O

C. MgSO4

D. BaSO4

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'Hollander beater' machine used in the paper manufacturing plant does not accomplish the task of

A. Final rolling out of paper

B. Cutting of fibres

C. Hydration of fibres

D. Fibrillation of fibre

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Silicone is a/an

A. Thermoplastic

B. Inorganic polymer

C. Monomer

D. None of these