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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