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4

Pick out the true statement pertaining to water treatment.

A. Slow sand filters can remove colour completely

B. Activated carbon can be used for taste & odour control without subsequent filtration

C. Application of activated carbon reduces the temporary hardness of water

D. Normally, the turbidity is removed by adding a coagulant prior to sedimentation

Correct Answer :

D. Normally, the turbidity is removed by adding a coagulant prior to sedimentation


Related Questions

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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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The manufacture of Kraft pulp is done by a/an __________ process.

A. Alkaline

B. Acidic

C. Neutral

D. None of these

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4

Main product in calcium carbide-water reaction is

A. Ca(OH)2

B. C2H2

C. CO2

D. CaCO3

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4

Chalcopyrite is the main ore of

A. Copper

B. Lead

C. Tin

D. Iron

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Hydrazine (N2H4) is used mainly as a/an

A. Explosive

B. Rocket fuel

C. Detergents additive

D. None of these

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4

Grignard reagent is chemically known as

A. Ethyl magnesium chloride

B. Methyl magnesium chloride

C. Dichlorophenol

D. Monochloroacetic acid

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__________ is a thermosetting plastic.

A. Polyvinyl chloride

B. Polythene

C. Bakelite

D. Teflon

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4

The purpose of tanning in leather industry is to

A. Stiffen the leather

B. Smoothen the leather

C. Make it flexible

D. Impart water resistance

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4

The most reactive allotropic form of phosphorus is __________ phosphorus.

A. Red

B. Yellow

C. Violet

D. Black

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4

Aryl benzene sulphonate (ABS) is a

A. Detergent

B. Plasticiser for unsaturated polyester

C. Starting material for the synthesis of glycerine

D. Coating ingredient for photographic film

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4

Which of the following is not a raw material used for the manufacture of ordinary glass?

A. Iron oxide

B. Soda ash

C. Limestone

D. Silica

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4

The most commonly used substance to speed up the sedimentation of sewage is

A. Lime

B. Sulphuric acid

C. Chlorine

D. Sodium bisulphite

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4

In sulphate pulp manufacture, the pressure and temperature in the digestor is

A. 10 atm., 800 °C

B. 10 atm., 170-180°C

C. 1 atm., 170 - 180°C

D. 1 atm., 800°C

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4

Plasticisers are added to paints to

A. Make it corrosion resistant

B. Make glossy surface

C. Give elasticity & prevent cracking of the film

D. Increase atmospheric oxidation

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Sodium bisulphite is used for __________ water.

A. Deaeration

B. Dechlorination

C. Both (A) & (B)

D. Neither (A) nor (B)

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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

Which of the following is an unsaturated fatty acid?

A. Lauric acid

B. Palmitic acid

C. Stearic acid

D. Oleic acid

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4

Black liquor is converted into white liquor by

A. Evaporation and burning the concentrate followed by causticisation of products

B. Multi-effect evaporation only

C. Selective liquid extraction

D. Extractive distillation

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Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?

A. High cost of mercury

B. High specific gravity of mercury

C. Non-availability of high purity mercury

D. Pollution of water stream by mercury

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4

Diaphragm electrolytic cell as compared to mercury electrolytic cell

A. Produces 70% NaOH solution

B. Requires less specific power consumption for the production of chlorine

C. Requires lesser investment for similar capacity

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

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4

Fluorescent dyes are added in detergents to

A. Act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics

B. Attain distinctiveness from other brands

C. Act as tarnish inhibitor for metals like German silver

D. None of these

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4

The catalyst used in the production of elemental sulphur from H2S (by oxidation-reduction) is

A. Alumina

B. Silica gel

C. Platinum

D. Nickel

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4

L.D. converter is used in the production of

A. Pig iron

B. Steel

C. Copper

D. Zinc

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4

Phthalic anhydride is made by the

A. Oxidation of naphthalene

B. Oxidation of benzene

C. Dehydrogenation of ethyl benzene

D. None of these

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4

Dehydrogenation of Isopropanol produces

A. Propyl alcohol

B. Acetone

C. Trichloroethylene

D. Formaldehyde

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4

Salt is added in the kettle during soap manufacture to separate

A. Soap from lye

B. Glycerine from lye

C. The metallic soap

D. The unsaponified fat from soap

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4

Tall oil obtained as a by-product from the black liquor recovery is

A. A black, sticky & viscous liquid

B. Used in the manufacture of greases, emulsions & soaps

C. Composed mainly of rosin & fatty acids

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

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4

The terminology 'BTX' used in coal tar distillation industry refers to

A. Benzol-toluol-xylol

B. Benzol-toluene-xylene

C. Benzene-toluol-xylol

D. Benzene-toluene-xylene

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4

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

Titanium dioxide is a/an __________ colour pigment.

A. White

B. Black

C. Yellow

D. Blue