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Current Affairs January 2024

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4

Sea weeds are an important source of

A. Fluorine

B. Chlorine

C. Bromine

D. Iodine

Correct Answer :

D. Iodine


Related Questions

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Chemical formula of oleum is

A. H2SO3

B. H2SO4

C. H2S2O7

D. H2SO7

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Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials.

A. Adsorbs

B. Oxidises

C. Reduces

D. Converts

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20% oleum means that in 100 kg oleum, there are 20 kg of

A. SO3 and 80kg of H2SO4

B. H2SO4 and 80kg of SO3

C. SO3 for each 100 kg of H2SO4

D. None of these

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4

An oil is converted into fat by its

A. Hydrogenation

B. Hydrolysis

C. Hydrocracking

D. Hydration

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4

Average sulphur content in Indian pyrites is about __________ percent.

A. 15

B. 35

C. 55

D. 70

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4

Plasticisers are added to synthetic plastics to

A. Impart flexibility

B. Improve workability during fabrication

C. Develop new improved properties not present in the original resins

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

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4

Chemical formula of 'salt cake' is

A. Na2SO4

B. CaSO4

C. MgSO4

D. BaSO4

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4

Parathion and Malathion are

A. Pesticides

B. Plasticisers for unsaturated polyesters

C. Pain-relieving drugs (analgesic)

D. Tranquilisers

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4

__________ is a polysaccharide.

A. Maltose

B. Starch

C. Sucrose

D. Glucose

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4

90% of the caprolactam is converted to nylon-6 on its condensation polymerisation in the reactor maintained at __________ °C.

A. < 0

B. 10-30

C. 250-280

D. 500-600

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4

A bio-catalyst produced by living cells which acts independent of the cell is called a/an

A. Substrate

B. Enzyme

C. Nutrient

D. None of these

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Saponification number of an oil or fat

A. Gives an idea about its molecular weight

B. Is inversely proportional to its molecular weight

C. Detects its adulteration

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

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4

The compressive strength of cement should not be less than about 110Kg/cm2 after three days & not less than 170Kg/cm2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm2/gm.

A. 800

B. 1600

C. 4000

D. 8500

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Epoxy resin

A. Is a good adhesive

B. Is an elastomer

C. Cannot be used for surface coatings

D. Is a polyester

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Raw materials for 'Solvay Process' for manufacture of the soda ash are

A. Salt, limestone and coke or gas

B. Ammonia, salt and limestone

C. Ammonia limestone and coke

D. None of these

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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

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Chemical name of soda ash is

A. Sodium bicarbonate

B. Sodium thiosulphate

C. Potassium carbonate

D. None of these

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4

High acid value of an oil or fat is an indication of

A. Storage under improper conditions

B. Absence of unsaturation

C. Its smaller molecular weight

D. None of these

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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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Superior quality laboratory apparatus is made of the __________ glass having low thermal coefficient of expansion & high chemical resistance.

A. Flint

B. Soda

C. Pyrex

D. Potash

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Massecuite is a terminology used in the __________ industry.

A. Paint

B. Oil hydrogenation

C. Soap

D. Sugar

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Roasting of metallurgical ores is done mainly to

A. Dehydrate it

B. Sinter the ore

C. Remove CO2 & H2O

D. Remove arsenic & sulphur

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4

Hydrochloric acid is also known as

A. Oil of vitriol

B. Muriatic acid

C. Strong organic acid

D. Green acid

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Which one of the following is not likely to be a constituent of vegetable oils?

A. Citric acid

B. Oleic acid

C. Stearic acid

D. Glycerol

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4

In an integrated steel plant, NH3 present in coke oven gas is normally recovered as

A. (NH4)2SO4

B. NH4Cl

C. (NH4)2 NO3

D. Liquid NH3

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4

Which oil is preferred for paint manufacture?

A. Drying oil

B. Non-drying oil

C. Semi-drying oil

D. Saturated oil

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4

Tall oil obtained as a by-product from the black liquor recovery is

A. A black, sticky & viscous liquid

B. Used in the manufacture of greases, emulsions & soaps

C. Composed mainly of rosin & fatty acids

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

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4

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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4

Anion exchanger is regenerated usually with

A. NaOH

B. H2SO4

C. Hydrazine

D. Alum solution

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4

Which of the following is an yellow pigment?

A. Titanium dioxide

B. Ferrous sulphate

C. Lead chromates

D. Zinc sulphides