Chemistry MCQs For WBCS Prelims P10

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Page 10

170391. Which among the following is called 'Laughing Gas' popularly?

A

Nitrogen pentaoxide

B

Nitrogen

C

Nitric oxide

D

Nitrous oxide

D

Correct Answer: D. Nitrous oxide

170492. Neutron was discovered by

A

Rutherford

B

Neil Bohr

C

J. Chadwick

D

J. J. Thomson

C

Correct Answer: C. J. Chadwick

170593. Colloidal particles do not settle down because

A

They carry an electrical charge

B

They become solvated

C

Their specific gravity is very low

D

They are present in far smaller quantity than that of the dispersion medium

D

Correct Answer: D. They are present in far smaller quantity than that of the dispersion medium

253494. The sulight energy used by green plants in photosynthesis istransformed into

A

Chemical energy

B

Physical energy

C

Both a) and b)

D

None

A

0 - 2018

Correct Answer: A. Chemical energy

253595. The ‘laughing gas’ is

A

hydrogen peroxide

B

nitrous oxide

C

carbon monoxide

D

sulphur dioxide

B

0 - 2017

Correct Answer: B. nitrous oxide

253696. Which of the following is also used as a lubricant?

A

Cuprite

B

Graphite

C

Haematite

D

Cryolite

B

0 - 2017

Correct Answer: B. Graphite

253797. Ozone Hole is caused by?

A

acetylene

B

ethylene

C

chlorofluorocarbons

D

methane

C

0 - 2016

Correct Answer: C. chlorofluorocarbons

253898. Strach is a

A

monosaccharide

B

disccharide

C

polysaccharide

D

none of the above

C

0 - 2016

Correct Answer: C. polysaccharide

253999. Vinegar is chemically known as

A

acetic acid

B

butyric acid

C

formic acid

D

tartaric acid

A

0 - 2016

Correct Answer: A. acetic acid

2540100. Which gas is known as ‘noble gas’?

A

hydrogen

B

oxygen

C

helium

D

carbon dioxide

C

0 - 2016

Correct Answer: C. helium

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WBCS Practice Set on General Science (Chemistry) P9

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Page 9

169381. Chemically Aspirin is :

A

Methyl salicylate

B

Ethyl salicylate

C

Acetylsalicylic acid

D

Sodium salicylate

C

Correct Answer: C. Acetylsalicylic acid

169482. Phenyl used in household work is a derivative of

A

Benzene

B

Anthracene

C

Methyl alcohol

D

Tartaric acid

A

Correct Answer: A. Benzene

169583. Dry ice is made up of

A

Hydrocarbon

B

Carbon dioxide

C

Water

D

Chlorine

B

Correct Answer: B. Carbon dioxide

169684. The geometry of SF4 is

A

octahedral

B

see-saw

C

square planar

D

tetrahedral

B

Correct Answer: B. see-saw

169785. The most abundant ions in the Bay of Bengal water are

A

Mg²⁺ and SO₄^2-

B

Fe²⁺ and Cl^-

C

Na⁺ and Cl^-

D

H⁺ and OH^-

A

Correct Answer: A. Mg²⁺ and SO₄^2-

169886. The most malleable metal is

A

Iron

B

Gold

C

Platinum

D

Silver

B

Correct Answer: B. Gold

169987. The white vitriol is

A

MgSO4 , 7H2O

B

CuSO4 , 5H2O

C

FeSO4 , 7H2O

D

ZnSO4 , 7H2O

D

Correct Answer: D. ZnSO4 , 7H2O

170088. Rate of radiation of heat from a body is the highest if its surface is

A

Smooth but black

B

Rough but black

C

White

D

Smooth

A

Correct Answer: A. Smooth but black

170189. Galvanization is deposition of

A

tin on iron

B

copper on iron

C

zinc on iron

D

aluminum on iron

C

Correct Answer: C. zinc on iron

170290. How many grams of NaOH are needed to make 100 ml. of a 0.5 M solution of NaOH (Atomic weight : Na = 23, O=16, H=1)

A

4

B

1

C

2

D

20

C

Correct Answer: C. 2

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Chemistry Practice Sets for WBCS, SSC, Rail, UPSC Exam P8

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Page 8

168371. Muriatic acid used in household work is a diluted form of

A

Oxalic acid

B

Aqua regia

C

Acetic acid

D

Hydrochloric acid

D

Correct Answer: D. Hydrochloric acid

168472. In underground Railways, the air is purified by using

A

Oxygen

B

Hydrogen peroxide

C

Ozone

D

None of the above

B

Correct Answer: B. Hydrogen peroxide

168573. Ozone depletion in the stratosphere is mainly caused by

A

Chlorofluorocarbon

B

Nitric Oxide

C

Sulphur-di-Oxide

D

Carbon dioxide

A

Correct Answer: A. Chlorofluorocarbon

168674. Which one of the following is not a metal?

A

Nickel

B

Silicon

C

Platinum

D

Mercury

B

Correct Answer: B. Silicon

168775. The volume of a vessel containing an ideal gas is doubled and its temperature (in °K) is also doubled. The pressure of the gas

A

In one-fourth of the original pressure

B

Is four times the original pressure

C

Remains unchanged

D

Is doubled

C

Correct Answer: C. Remains unchanged

168876. Which of the following substances can act as an only reducing agent?

A

K₂Cr₂O₇

B

H₂S

C

H₂O₂

D

MnO₂

B

Correct Answer: B. H₂S

168977. Hydrogen peroxide has the same number of electrons as (Iso-electronic Species)

A

CH₂ = CH₂

B

CH₃CHO

C

HCHO

D

CH₃OH

D

Correct Answer: D. CH₃OH

169078. Vulcanization is the process of heating rubber with 3-5 % of

A

Potassium permanganate

B

Naphthalene

C

Sulphur

D

Lime

C

Correct Answer: C. Sulphur

169179. Paint and Varnish contains

A

Mustard oil

B

Kerosene oil

C

Linseed oil

D

Coconut oil

C

Correct Answer: C. Linseed oil

169280. Which pollutant of the atmosphere inhibits the Hill reaction of photosynthesis?

A

Ultraviolet rays

B

Hydro Carbon

C

Peroxyacetyl nitrate

D

Nitrogen monoxide

C

Correct Answer: C. Peroxyacetyl nitrate

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WBCS Prelims and Mains MCQs on General Science (Chemistry) P7

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Page 7

167361. X-ray fails to pass through

A

Iron

B

Gold

C

Flesh

D

Bone

D

Correct Answer: D. Bone

167462. The Greenhouse effect gases trap only the heat of following radiations

A

Solar

B

Ultraviolet

C

Both A and B

D

Infrared

D

Correct Answer: D. Infrared

167563. Fullerene is

A

Artificial emery

B

A compound of carbon

C

An allotrope of carbon

D

A synonym for carborundum

C

Correct Answer: C. An allotrope of carbon

167664. Blood hemoglobin contains the metal

A

Copper

B

Iron

C

Aluminum

D

Magnesium

B

Correct Answer: B. Iron

167765. In 1775 a scientist experimentally showed that air consists of two gases. The name of the scientist is

A

Darwin

B

Davy

C

Priestley

D

Lavoisier

C

Correct Answer: C. Priestley

167866. Milk is an example of

A

emulsion

B

gel

C

suspension

D

solution

A

Correct Answer: A. emulsion

167967. The resistance of which of the following decreases with the rise of temperature?

A

Silicon

B

Mercury

C

Copper

D

Iron

A

Correct Answer: A. Silicon

168068. Which of the following processes makes direct use of oxygen?

A

Citric Acid Cycle

B

Electron transport

C

Glycolysis

D

Fermentation

B

Correct Answer: B. Electron transport

168169. Which one of the following is in the mixture of sympathetic ink?

A

Magnesium chloride and water

B

Zinc chloride and water

C

Cobalt chloride and water

D

None of the above

C

Correct Answer: C. Cobalt chloride and water

168270. Normal saline is an aqueous solution of sodium chloride of strength

A

1.00 molar

B

1

C

0.84%

D

1.00 normal

C

Correct Answer: C. 0.84%

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General Science MCQs with Answers For UPSC, SSC, WBPSC Exams P6

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Page 6

166351. All reactions involving the chemical decomposition

A

Are reversible and endothermic

B

Maybe reversible or irreversible and exothermic or endothermic

C

Are reversible

D

Are endothermic

B

Correct Answer: B. Maybe reversible or irreversible and exothermic or endothermic

166452. When a helium atom loses an electron, it is converted to a

A

Deuteron

B

Helium ion

C

Proton

D

particle

B

Correct Answer: B. Helium ion

166553. Which ones of the following are called Noble gases?

A

Argon and Neon

B

Hydrogen and Neon

C

Oxygen and Hydrogen

D

Oxygen and Argon

A

Correct Answer: A. Argon and Neon

166654. Chlorine is not a constituent of

A

Chloroform

B

Bleaching powder

C

DDT

D

Chlorophyll

D

Correct Answer: D. Chlorophyll

166755. Which among the following gas was leaked during the Bhopal gas tragedy in 1984?

A

Methyl isochloride

B

Methyl isochlorate

C

Methyl isocyanide

D

Methyl isocyanate

D

Correct Answer: D. Methyl isocyanate

166856. In the manufacture of Vanaspati ghee from vegetable oils, which among the following gas is used?

A

Hydrogen

B

Neon

C

Nitrogen

D

Carbon dioxide

A

Correct Answer: A. Hydrogen

166957. Calculate the shielding suffered by valence electron in fluorine

A

5.80

B

4.85

C

5.20

D

4.80

D

Correct Answer: D. 4.80

167058. The unit of radioactivity is

A

Curie

B

Einstein

C

Plank

D

None of the above

A

Correct Answer: A. Curie

167159. The toxic chemical element that caused Minamata disease in Japan was

A

Cadmium

B

Arsenic

C

Uranium

D

Mercury

D

Correct Answer: D. Mercury

167260. One of the breakthroughs of Acharya P.C. Roy was to synthesize the following compound

A

Hg₂Cl₂

B

H₂O₄

C

HgCl₂

D

HgO

C

Correct Answer: C. HgCl₂

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WBCS Previous Years MCQs on General Science (Chemistry) P5

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Page 5

165341. Artificial rain is caused by spraying small pellets of which of the following over clouds?

A

NaOH

B

NH₄Cl

C

Ice

D

Dry ice

D

Correct Answer: D. Dry ice

165442. The term PVC used in the plastic industry stands for

A

Poly Vinyl Chloride

B

Phospho Vanadium Chloride

C

Phospho Vinyl Chloride

D

Poly Vinyl Carbonate

A

Correct Answer: A. Poly Vinyl Chloride

165543. Which among the following is responsible for the depletion of the Ozone layer?

A

Chlorofluorocarbon

B

Mercuric oxide

C

Carbon monoxide

D

Carbon dioxide

A

Correct Answer: A. Chlorofluorocarbon

165644. Aluminium powder mixed with linseed oil is used as

A

Insecticide

B

Explosive

C

Paint

D

Fertilizer

C

Correct Answer: C. Paint

165745. The half-life period of an isotope is 2 hours After 6 hours what fraction of the initial quantity of the isotope will be left behind?

A

1/8

B

1/4

C

1/6

D

1/3

A

Correct Answer: A. 1/8

165846. Nuclei of radioactive elements emit

A

Either protons or neutrons

B

Neither protons nor neutrons

C

Neutrons

D

Protons

B

Correct Answer: B. Neither protons nor neutrons

165947. L.P.G. Cylinders contain inside

A

Isobutane and Propane

B

Butane, Isobutane, and Propane

C

Butane and Isobutane

D

Butane and Propane

B

Correct Answer: B. Butane, Isobutane, and Propane

166048. Which one of the following is an element?

A

Graphite

B

Glass

C

Table salt

D

Water

A

Correct Answer: A. Graphite

166149. At constant temperature, if the pressure decrease, then the volume of a given mass of gas will

A

Remain constant

B

May increase or decrease depending on the nature of the gas

C

Increase

D

Decrease

C

Correct Answer: C. Increase

166250. Which of the following is physical change?

A

Magnetizing a needle

B

Rusting of iron

C

Radioactive decay

D

Photosynthesis

A

Correct Answer: A. Magnetizing a needle

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