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4

Washing soda is chemically represented by

A. Na2CO3

B. Na2CO3.H2O

C. Na2CO3.10H2O

D. NaHCO3

Correct Answer :

C. Na2CO3.10H2O


Related Questions

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4

In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 2SO3), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by

A. Increasing the oxygen concentration

B. Putting more quantity of V2O5 catalyst in the converter

C. Removing some quantity of SO3 during intermediate stage

D. Maintaining low temperature & pressure in the converter

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4

Pick out the wrong statement.

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

B. Portland cement is made employing wet process

C. Gypsum is added to Portland cement to lengthen its setting time

D. None of these

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4

Good quality of edible salt is obtained from brine by the process of

A. Solar evaporation

B. Vacuum evaporation

C. Freeze drying

D. Electrolysis

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4

Temporary hardness of water can be removed by

A. Addition of alum (a coagulant)

B. Boiling

C. Filtration (through gravity sand filter)

D. Addition of lime

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4

Solvent used for extraction of oil is

A. Hexane

B. Methyl ethyl ketone

C. Furfural

D. None of these

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4

Sodium salt of higher molecular weight fatty acid is termed as the __________ soap.

A. Hard

B. Soft

C. Metallic

D. Lubricating

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4

Which allotrope of sulphur is insoluble in carbon disulphide?

A. Rhombic sulphur

B. Monoclinic sulphur

C. Plastic sulphur

D. Milk of sulphur

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4

A substance produced by a living organism and capable of anti-microbial activity is called a/an

A. Antibiotic

B. Antiseptic

C. Disinfectant

D. None of these

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4

Fat dispersed in water is exemplified by

A. Colloids

B. Gel

C. Butter

D. Emulsion

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4

Paper grade bamboo contains about __________ percent cellulose.

A. 5

B. 20

C. 40

D. 60

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4

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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4

Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo?

A. Depithing

B. Digestion

C. Bleaching

D. None of these

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4

Which of the following impurities in feed water for high pressure boiler is the most detrimental?

A. Silica

B. Dissolved oxygen

C. Suspended salt

D. Dissolved salt

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4

Raw material used in alcohol distilleries in India is

A. Molasses

B. Benzol

C. Methylated spirit

D. None of these

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4

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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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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4

BHC (Benzene hexachloride) is made by the chlorination of benzene

A. Which is an addition reaction

B. Which is a substitution reaction

C. In absolute dark

D. In presence of sunlight

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4

Cumene is the starting material for the production of

A. Benzoic acid

B. Phenol and acetone

C. Isoprene

D. Styrene

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4

DDT should not be allowed to come in contact with iron (during its manufacture) to

A. Avoid its decomposition

B. Prevent sulphonation of the monochlorobenzene by the acid catalyst

C. Achieve non-hygroscopic property

D. None of these

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4

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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4

Molecular weights of polymers are in the range of

A. 102 - 102

B. 105 - 109

C. 102 - 107

D. 109 - 1011

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4

Terylene is

A. Same as Dacron

B. A polyester

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

Which of the following, when pyrolysed, produces Perchloroethylene?

A. Ethylene dichloride

B. Chlorobenzene

C. Carbon tetrachloride

D. Chlorinated paraffin

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4

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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4

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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4

Finely ground calcium aluminate & silicate is a/an

A. Cermet

B. Cement

C. Abrasive

D. Explosive

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4

Gypsum is chemically

A. Calcium chloride

B. Potassium sulphate

C. Sodium sulphate

D. Calcium sulphate

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4

A cane sugar factory having sugar production rate of 10 tons/day will produce about __________ tons/day of bagasse (after consumption by the factory for heating etc.).

A. 1

B. 10

C. 25

D. 40

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4

Higher viscosity index of a lubricating oil denotes

A. Less changes in fluidity of oil with temperature

B. Substantially high change in fluidity of oil with temperature

C. Its unsuitability under varying temperature conditions

D. None of these

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4

Deacon's method is used for the manufacture of

A. Glauber's salt

B. Common salt

C. Chlorine

D. Graphite electrode