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__________ is an ore concentrating metallurgical process involving a chemical change.

A. Electromagnetic separation

B. Froth floatation

C. Roasting

D. None of these

Correct Answer :

C. Roasting


Related Questions

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Oil is a/an

A. Mixture of glycerides

B. Mixture of glycerides of fatty acids

C. Solid at normal temperature

D. Ester of alcohols other than glycerine

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Alum [Al2(SO4)3] is used as a coagulant in water treatment to remove

A. Colour

B. Turbidity

C. Bacteria

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

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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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Dechlorination of treated water is necessary to

A. Remove residual turbidity

B. Reduce the bacterial load on filter

C. Control taste and odour

D. Remove chlorinous taste

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Carbon tetrachloride (CCl4) is the starting raw material for the manufacture of

A. Trichloroethylene

B. Perchloroethylene

C. Parathion

D. Methanol

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Bromine is used in the preparation of

A. Fire extinguishing compounds

B. Fire proofing agents

C. Dyes and antiknock compounds

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

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Fat dispersed in water is exemplified by

A. Colloids

B. Gel

C. Butter

D. Emulsion

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During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to

A. Increase the rate of absorption

B. Avoid corrosion

C. Reduce the cooling water circulation rate

D. None of these

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4

Portland cement consists mainly of

A. CaO & SiO2

B. SiO2 & Al2O3

C. CaO & Al2O3

D. CaO & Fe2O3

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__________ process is used for the commercial production of nitric acid by the catalytic oxidation of ammonia.

A. Solvay

B. Ostwald's

C. Haber's

D. None of these

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Rotary kiln is not involved in the production of

A. Cement

B. Lime from limestone

C. Slaked lime from quick lime

D. None of these

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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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Bisphenol A is produced by the condensation of acetone with

A. Formaldehyde

B. Ethyl alcohol

C. Diethyl ether

D. Phenol

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The most stable allotropic form of phosphorous is the __________ phosphorous.

A. White

B. Black

C. Yellow

D. Red

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Systemic insecticides

A. Are absorbed throughout the plant

B. Kill insects following external bodily contact

C. Are stomach poisons

D. Emit poisonous vapour

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Presence of H2S in raw water (to be chlorinated) results in the

A. Reduced softening capacity of zeolite

B. Increased dosage of chlorine to provide a disinfecting residual in the water

C. Easy removal of its hardness

D. None of these

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What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell?

A. Cl2 & Na

B. Cl2 & H2

C. O2 & H2

D. Cl2, H2 & NaOH solution

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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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Industrial production of chloroform requires acetone and

A. Phosgene

B. Calcium hypochlorite

C. Chlorine

D. Ammonium chloride

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Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of

A. Nitric acid

B. Hydrochloric acid

C. Methyl alcohol

D. Formic acid

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Metallic soap is __________ salt of fatty acids.

A. Sodium

B. Potassium

C. Both sodium & potassium

D. Aluminium or calcium

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Permanent hardness of water can be removed by

A. Boiling

B. Adding Ca(OH)2

C. Boiling it with Na2CO3

D. None of these

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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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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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The most economical pulp for the production of newsprint would be the __________ pulp.

A. Ground-wood

B. Sulphate

C. Sulphite

D. Semi-chemical

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Flash point of most vegetable oils is about __________ °C.

A. 50

B. 100

C. 200

D. 300

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Which glass is usually used in optical work?

A. Lead glass

B. High silica (borosilicate) glass

C. Photo-sensitive glass

D. Fibre glass

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Phenol formaldehyde is produced by condensation polymerisation. It is also known as

A. Teflon

B. Bakelite

C. Polyester

D. Nylon-66

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Conversion of CO to CO2 by steam in presence of a catalyst is called

A. Steam reforming

B. Shift conversion

C. Steam gasification

D. None of these

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Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulfonic acid produces sodium dodecylbenzene sulphate, which is a/an

A. Explosive

B. Soap

C. Detergent

D. Analgesic drug