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

A. White

B. Black

C. Yellow

D. Red

Correct Answer :

B. Black


Related Questions

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Acrylonitrile is mainly used in the __________ industry.

A. Polymer

B. Printing

C. Dyeing

D. Photographic

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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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Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ °C.

A. -5 to 0

B. 5 to 10

C. 30 to 50

D. 75 to 80

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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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At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants.

A. Independent of

B. Directly proportional to

C. Inversely proportional to

D. Proportional to the square of

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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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Percentage of glycerine present in the spent lye obtained during soap manufacture is about

A. 0.5

B. 5

C. 20

D. 35

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Oxygen is produced by fractionation of air using __________ process.

A. Linde's

B. Claude's

C. Either (A) or (B)

D. None of these

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Polycaprolactam is commercially known as

A. Nylon-6

B. Nylon-66

C. Dacron

D. Rayon

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CO & H2 are the constituents of

A. Producer gas

B. Water gas

C. Coke oven gas

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

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Manufacture of phthalic anhydride uses __________ as a catalyst.

A. Ni

B. Cr

C. V2O5

D. Al2O3

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Argon is the third largest constituent of air (followed by N2 & O2). Its percentage by volume in air is

A. 0.14

B. 0.34

C. 0.94

D. 1.4

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Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement?

A. Xanthates

B. Stearic acid

C. Calcium & aluminium stearate

D. Formic acid

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Penicillin, an antibiotic drug was discovered by

A. Alexander

B. Flaming

C. Doctor Zhivago

D. None of these

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Which of the following processes can remove both temporary as well as permanent hardness of water?

A. Filtration

B. Boiling

C. Distillation

D. None of these

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Which of the following is a constituent of vinegar?

A. Around 10% alcohol

B. Around 1% acetic acid

C. Both (A) and (B)

D. Neither (A) nor (B)

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The catalyst used in shift converter is

A. Nickel

B. Vanadium

C. Silica gel

D. Alumina

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Synthetic glycerine is produced from

A. Toluene

B. Phenol

C. Propylene

D. Naphthalene

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Baking soda is chemically represented by

A. Na2CO3

B. NaHCO3

C. Na2CO3.H2O

D. Na2CO3.10H2O

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Pick out the wrong statement.

A. Low intensity explosives are also called propellants, whereas high intensity explosive are called detonators

B. Gun powder comprises of 75% salt petre, 15% charcoal and 10% sulphur

C. Lead azide is a popular military explosive

D. TNT is a hygroscopic explosive having very high melting point and is non-toxic to human being

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Separation of fresh water from sea water can be done by the __________ operation.

A. Osmosis

B. Reverse osmosis

C. Absorption

D. Adsorption

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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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Gun powder, which is an explosive comprises of charcoal, sulphur and

A. Glycerine

B. Salt petre

C. Nitro glycerine

D. Dynamite

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Viscose rayon is

A. Cellulose nitrate

B. Regenerated cellulose nitrate

C. Regenerated cellulose acetate

D. None of these

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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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__________ is a polysaccharide.

A. Maltose

B. Starch

C. Sucrose

D. Glucose

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Which of the following is a constituent of coffee?

A. Caffeine

B. Nicotine

C. Calgon

D. Lignin

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Bleaching of paper pulp is done with

A. Activated clay

B. Bromine

C. Chlorine or chlorine dioxide

D. Magnesium sulphite

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Carbon content of pitch (residue of coal tar distillation) is around __________ percent.

A. 70

B. 55

C. 80

D. 94

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In the production of soda ash by Solvay process, the by-product is

A. CaCl2

B. NH4Cl

C. NH3

D. NaOH