Chemical Process Quiz 8

1 / 50

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

Easy removal of its hardness

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

Reduced softening capacity of zeolite

None of these

2 / 50

Polymerisation product of C2F4 (carbon tetrafluoride) is called P.T.F.E (poly chloro tetra fluoro ethylene). It is also called_____?

Teflon

Polyurethane

Silicone

Epoxy resin

3 / 50

Pick out the wrong statement ?

Production of cold SBR employs lower pressure as compared to that of hot SBR

Cold rubber (SBR) is superior as compared to hot rubber (SBR)

None of these

Polymerisation temperature can modify the properties of SBR

4 / 50

Presence of carbonaceous matter in the sewage______?

Increases the quantity of chlorine used for its purification

Reduces sulphate ions to sulphides causing obnoxious smell

Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures

All A, B. and C.

5 / 50

Plaster of Paris is ___________?

Used for setting of broken bones

Same as gypsum

CaSO4.?H2O

Both A. and B.

6 / 50

Pick out the wrong statement?

Red color is imparted to glass by addition of arsenic oxide

Glass is decolorized during its manufacture by adding antimony oxide, manganese dioxide or arsenic oxide

Ordinary glass is represented chemically by Na2O . CaO . 6SiO2

Hard glass which is used for making laboratory glass wares is a mixture of sodium borosilicate and aluminium borosilicate

7 / 50

Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction___________?

Decreases with decrease of thickness of the flakes

Increases with the increasing flake size keeping the flake thickness constant

Increases considerably with the rise of temperature

Decreases as the moisture content of flakes increases

8 / 50

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

A measure of its unsaturation

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

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

Helpful in findings its adulteration & its suitability for making soap

9 / 50

Phthalic anhydride is made by the ________?

None of these

Oxidation of naphthalene

Oxidation of benzene

Dehydrogenation of ethyl benzene

10 / 50

Plasticisers are added to synthetic plastics to______?

Impart flexibility

All A, B. and C.

Develop new improved properties not present in the original resins

Improve workability during fabrication

11 / 50

Pick out the wrong statement ?

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

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

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

Lead azide is a popular military explosive

12 / 50

Poly Tetrafluoroethylene (P.T.F.E.) is known as_____?

Celluloid

Bakelite

Teflon

Dacron

13 / 50

Pick out the wrong statement ?

Alkali consumption in digestion/cooking of bamboo is measured in terms of permanganate number

Presence of sodium sulphate in pulp makes the pulp bleachability poor

Fibrillation of fibre during paper manufacture is done to develop the strength in paper

Bagasse fibre contains both lignin & cellulose

14 / 50

Process conditions in fermentator used for production of penicillin is______?

30?C, 200 mm Hg (absolute)

90?C, 45 atm

50?C, l0 atm

25?C, 2 atm

15 / 50

Pick out the wrong statement ?

Acetylene gas cannot be used for illumination purpose

Strongly caking coal should not be used in the Lurgi gasifier

Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels

Water gas is called blue gas because of the color of the flame, when it is burnt

16 / 50

Pick out the wrong statement pertaining to nitric acid ?

It is a strong mono basic acid which reacts with almost all the metals except noble metals

About 90% of nitric acid is manufactured by Ostwald?s process

Arc process of nitric acid manufacture is economical as compared to Ostwald?s process

Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO2)

17 / 50

Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because___________?

All A, B. and C.

Its calorific value is very less

Tar neutralises the residual acids present in pitch

It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop

18 / 50

Presence of sodium tripolyphosphate (an additive) in synthetic detergent_____?

Does not allow redeposition of dirt on the cleaned surface

Inhibits its corrosive effects

Facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions)

None of these

19 / 50

Pick out the true statement pertaining to water treatment ?

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

Application of activated carbon reduces the temporary hardness of water

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

Slow sand filters can remove colour completely

20 / 50

Pick out the wrong statement ?

Catalytic hydrogenation of carbon monoxide produces methyl alcohol

Raw materials for DDT manufacture are benzene and chlorine

Ethanolamines are produced by using ammonia and ethylene oxide as raw material

In nylon-6, the number 6 represents the total number of carbon atoms in the ring

21 / 50

Polymethyl methacrylate (PMMA) is known as ______?

Bakelite

Teflon

Nylon-6

Perspex

22 / 50

Production of one ton of cement requires about ________ tons of limestone ?

1.2

2.2

0.6

3.8

23 / 50

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

Sulphur

Arsenic

Lead

Carbon

24 / 50

Phthalic anhydride is produced by the oxidation of __________?

Benzene

Naphthalene

Aniline

Toluene

25 / 50

Pick out the endothermic reaction out of the following ?

CO + 3H2 = CH4 + H2O

CaCO3 = CaO + CO2

CO + ?O2 = CO2

C+ ?O2 = CO

26 / 50

Pick out the wrong statement?

Dry process is used for the manufacture of cement, when the raw material is blast furnace slag

Portland cement is made employing wet process

Gypsum is added to Portland cement to lengthen its setting time

None of these

27 / 50

Pick out the false statement pertaining to water treatment ?

Water with pH value less than 7, is acidic

Sodium sulphate or sodium carbonate do not cause hardness in water

Aeration of water is effective in CO2 removal

The zeolite water softening process reduces the hardness of water by not more than 50%

28 / 50

Production of one ton of dry paper pulp requires about _____ tons of bamboo or wood?

2.5

29 / 50

Pig iron is produced by blast furnaces in India using mostly the iron ore named ________?

Siderite

Magnetite

Hematite

Chalcopyrite

30 / 50

Pick out the wrong statement ?

Contact process of sulphuric acid manufacture produces pure acid of concentration ? 98%

75% oleum can be produced by distillation of 20% oleum

Contact process of sulphuric acid manufacture uses nickel as the catalyst

Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80%

31 / 50

Producer gas consists mainly of__________?

H2, CH4

C2H2, CO2, H2

CO, H2

CO, CO2 N2, H2

32 / 50

Pick out the wrong statement?

Decomposition of sulphuric acid on heating does not start before its boiling

Vitriol oil is nothing but technical sulphuric acid

Conversion of SO2 to SO3 in Monsanto-4 pass converter is about 98%

The chemical formula of oleum is H2S2O7, which is formed by saturating sulphuric acid with sulphur trioxide

33 / 50

Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have_____?

Sharp melting points

Low co-efficient of thermal expansion

High electrical insulation properties

Compressive strength much greater than their tensile strengths

34 / 50

Portland cement consists mainly of___________?

SiO2 & Al2O3

CaO & Al2O3

CaO & Fe2O3

CaO & SiO2

35 / 50

Pick out the wrong statement ?

Both temperature and pressure in the digestor is less in case of the sulphite method as compared to that in the sulphate method

Kraft method of pulp manufacture can process all types of fibrous raw materials

Digestion time for bagasse is less than that for wood base materials

None of these

36 / 50

Prussian blue is chemically represented by___________?

AlF3 . 3NaF

FeO.TiO2

Fe4 [Fe (CN6)3]

Ca SO4 . 2H2O

37 / 50

Polythene is a/an _______ polymerisation product?

Addition

Condensation

Thermosetting

None of these

38 / 50

Pick out the wrong statement pertaining to the soap manufacture?

Organic pigments are used as colouring materials in the soap manufacture

Transparent soaps are made by cold process

Both laundry as well as toilet soaps are manufactured by hot process

Colourless rosin is used in the manufacture of laundry soaps

39 / 50

Pick out the wrong statement?

Basic dyes (e.g. amino derivatives) are applied mostly to paper

None of these

Azoic dyes are mostly applied on cotton fabrics

Mordant dyes are applied mainly to wools

40 / 50

Platinum catalyst used in the earlier days of sulphuric acid manufacture by contact process suffers from the drawback like__________?

Fragile nature

High cost

All A, B. and C.

Easy poisoning tendency

41 / 50

Polyvinyl chloride (PVC) is______?

Made by employing emulsion polymerisation

None of these

A thermosetting material

A condensation polymerisation product

42 / 50

Polycaprolactam is commercially known as_____?

Dacron

Nylon-66

Nylon-6

Rayon

43 / 50

Potassium is kept & transported under _____ ?

Water

Kerosene oil

Alcohol

Liquid ammonia

44 / 50

Production of alcohol by fermentation of molasses is a/an ______ process?

Aerobic

Endothermic

Both B. and C.

Anaerobic

45 / 50

Phthalic anhydride is used______?

For making nylon-6

In making PVC

As plasticisers

In insecticides manufacture

46 / 50

Phosphoric acid is prepared from_______?

Rock phosphate

Chalcopyrite

Cryolite

None of these

47 / 50

Pick out the wrong statement ?

The rate of chemical reaction is independent of the concentration of reactants at high concentration of enzymes

Protein catalysts are called enzymes

Wine, rum & Vodka are prepared by the formulation of fruit juice, sugar beet & rye respectively

Total sugar content in molasses is about 10%

48 / 50

Pick out the exothermic reaction out of the following ?

MgCO3 = MgO + CO2

C + H2O = CO + H2

CaC2 + H2O = Ca(OH)2 + C2H2

All (A), B. and (C)

49 / 50

Plasticisers are added to paints to________?

Increase atmospheric oxidation

Make glossy surface

Make it corrosion resistant

Give elasticity & prevent cracking of the film

50 / 50

Pick out the wrong statement ?

Bakeries and breweries make use of yeasts

Oils and fats are alkaloids

Pasteurisation of milk involves moderate heating followed by cooling

Enzyme is a complex nitrogenous compound

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