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__________ of quicklime produces slaked lime.

A. Hydration

B. Dehydration

C. Hydrogenation

D. None of these

Correct Answer :

A. Hydration


Related Questions

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Platinum is a versatile catalyst for many processes in chemical industries. It is highly prone to be poisoned by the presence of

A. Carbon

B. Arsenic

C. Lead

D. Sulphur

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Lithophane is

A. Explosive

B. White lead

C. Filter aid

D. ZnS (white pigment)

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Average sulphur content in Indian pyrites is about __________ percent.

A. 15

B. 35

C. 55

D. 70

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Cation exchanger is regenerated usually with

A. NaOH

B. H2SO4

C. Hydrazine

D. Alum solution

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Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used

A. As a lubricant

B. As a rust preventive

C. In hard water for cleaning of cloth

D. As a foam depressant in distillation column

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Polythene is a/an __________ polymerisation product.

A. Addition

B. Condensation

C. Thermosetting

D. None of these

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White phosphorous is stored under water, because

A. It does not react with water

B. It is poisonous

C. Its kindling temperature in dry air is very low

D. It is unstable

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The major constituent of black liquor generated during paper manufacture is sodium

A. Sulphate

B. Carbonate

C. Hydroxide

D. Bi-carbonate

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4

Reaction of calcium carbide with water produces a gas, which is used

A. As an illuminant

B. For metal cutting/welding

C. Both (A) & (B)

D. Neither (A) nor (B)

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Which of the following is an yellow pigment?

A. Titanium dioxide

B. Ferrous sulphate

C. Lead chromates

D. Zinc sulphides

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Manufacture of phthalic anhydride uses __________ as a catalyst.

A. Ni

B. Cr

C. V2O5

D. Al2O3

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Glycerine can be obtained from

A. Fat

B. Naphthalene

C. Cumene

D. Sucrose

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Use of hydrated lime in water treatment

A. Before filtration, reduces the bacterial load on filters

B. After filtration, combats the corrosiveness of water due to the presence of O2 & CO2

C. Is to adjust the pH value

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

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Acetone is produced by catalytic dehydrogenation of

A. Phenol

B. Naphthalene

C. Isopropanol

D. Ethyl benzene

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Paper grade bamboo contains about __________ percent cellulose.

A. 5

B. 20

C. 40

D. 60

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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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__________ is produced using Polycondensation reaction.

A. Polythene

B. Phenol formaldehyde

C. Poly vinyl chloride

D. None of these

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4

Glass is

A. Mainly CaO

B. Subjected to galvanising

C. A super cooled liquid

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

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Lindane is

A. Not a fumigant

B. BHC (Benzene Hexachloride) containing 99% γ-isomer

C. A by-product of BHC manufacture

D. Both (B) and (C)

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4

Pick out the wrong statement. Iodine value of an oil or fat is

A. The number of grams of iodine taken up by 100 gm of oil or fat

B. A measure of its unsaturation

C. Helpful in findings its adulteration & its suitability for making soap

D. Independent of the type of oil, whether it is drying or non-drying

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More than 100 percent of __________ is present in oleum.

A. SO3

B. H2SO4

C. H2SO3

D. SO2

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The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is

A. Dilute H2SO4

B. Oleum

C. Ultraviolet light

D. None of these

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Ca(OH)2 is called

A. Quicklime

B. Slaked lime

C. Limestone

D. Gypsum

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Reverse osmosis is normally used for the

A. Separation of isotopes of uranium from gaseous uranium hexafluoride

B. Separation of helium from natural gas

C. Desalination of brackish water to produce potable (drinking) water

D. Purification of oxygen

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4

Resistance to fusion of the refractory under a steady rising temperature condition is called

A. Spalling

B. Refractoriness

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

Alum is commercially produced from

A. Gypsum

B. Feldspar

C. Galena

D. Bauxite

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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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__________ 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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Pasteurisation of milk means

A. Removal of fatty and albuminous substance from it

B. Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics

C. Inhibiting the growth of micro-organisms without killing them

D. None of these

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Phosphoric acid is prepared from

A. Cryolite

B. Chalcopyrite

C. Rock phosphate

D. None of these