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4

Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent.

A. 10

B. 25

C. 50

D. 98

Correct Answer :

C. 50


Related Questions

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

A. Its calorific value is very less

B. Tar neutralises the residual acids present in pitch

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

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

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4

Claude process of gas liquefaction employs

A. Merely compression of gas beyond its critical pressure

B. Joule-Thomson expansion cooling

C. Heat exchange with colder stream

D. Adiabatic expansion against a piston or in a turbine

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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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Dehydrogenation of ethyl benzene produces

A. Styrene

B. Naphthalene

C. Phenol

D. Benzoic acid

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Adipic acid is an intermediate in the manufacture of

A. Perspex

B. Nylon-66

C. Polystyrene

D. Bakelite

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Contact process of sulphuric acid manufacture

A. Yields acid of higher concentration than chamber process

B. Yields acids of lower concentration than chamber process

C. Is obsolete

D. Eliminates absorber

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Concentration of sulphide ores is done usually by

A. Roasting

B. Smelting

C. Froth floatation

D. Electromagnetic separation

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The end bleaching agent used to move last traces of colour bodies from the pulp is

A. Chlorine dioxide (ClO2)

B. MgO

C. SO2 gas

D. Mercaptans

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Cumene (isopropyl benzene) is made by

A. Oxidation of naphthalene

B. Propylene alkylation of benzene

C. Polymerisation of a mixture of benzene & propylene

D. None of these

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4

Baking soda is chemically represented by

A. Na2CO3

B. NaHCO3

C. Na2CO3.H2O

D. Na2CO3.10H2O

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4

Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent.

A. 75

B. < 10

C. > 30

D. 50

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4

Permanent hardness of water can be removed by

A. Addition of soda ash to it

B. Treating it with zeolites

C. Passing it through sodium hexametaphosphate

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

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4

Pick out the exothermic reaction out of the following:

A. C + H2O = CO + H2

B. CaC2 + H2O = Ca(OH)2 + C2H2

C. MgCO3 = MgO + CO2

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

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4

Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is

A. A slow reaction

B. A discontinuous reaction (requiring regeneration of iron by water gas intermittently)

C. Still in development stage (by employing fluidised bed technique)

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

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Which of the following is not responsible for causing permanent hardness of water?

A. Ca(HCO3)2

B. CaCl2

C. MgCl2

D. None of these

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Main constituents of Portland cement are calcium aluminate and

A. Gypsum

B. Silicates

C. Sodium silicate

D. Carbonates

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Iron ore hematite is concentrated using

A. Electromagnetic separation mainly

B. Gravity separation

C. Froth floatation

D. Roasting

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__________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.

A. Chlorine

B. Ammonium chloride

C. Sodium carbonate

D. Sodium bi-carbonate

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4

Nylon-6 is a

A. Polyamide

B. Thermosetting resin

C. Polyester

D. None of these

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Esterification reaction produces

A. Detergent

B. Vanaspati

C. Soap

D. Mercaptans

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A mineral is termed as 'ore', if

A. A metal can be economically extracted from it

B. It contains ≥ 40% metal

C. The metal present in it is costly

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

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4

High purity nitrogen is used in

A. Making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils

B. Fire fighting purposes

C. Both (A) & (B)

D. Neither (A) nor (B)

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Cement setting under water employs a/an __________ process.

A. Hydration

B. Decomposition

C. Oxidation

D. Reduction

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4

Varnish does not contain

A. Thinner

B. Pigment

C. Both (A) & (B)

D. Neither (A) nor (B)

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Hydrogenation of oil does not

A. Remove double bonds

B. Raise its melting point

C. Improve its resistance to oxidation

D. None of these

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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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__________ is produced using molasses as the starting raw material.

A. Methyl alcohol

B. Ethyl alcohol

C. Benzol

D. Dimethyl ether

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Nickel is not used as a catalyst in the

A. Fischer-Tropsch process

B. Shift conversion

C. Hydrogenation of oil

D. Ostwald's process of HNO3 manufacture

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Sulphur removal by heating of pyrite ore in presence of air is called its

A. Reduction

B. Roasting

C. Calcination

D. Smelting

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Refractory bricks having high thermal conductivity is desirable, when it is to be used in the

A. L.D. converter

B. Blast furnace

C. Rotary kiln

D. Recuperator