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Chemistry questions and answers

Chemistry Questions and Answers

Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.

286.

Neutrons were discovered by?

A.

James Chadwick

B.

Ernest Rutherford

C.

J.J Thompson

D.

John Dalton

Correct answer is A

 - Sir James Chadwick, was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932. 

- Ernest Rutherford postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay.

- Sir Joseph John Thomson was a British physicist and Nobel Laureate in Physics, credited with the discovery of the electron, the first subatomic particle to be discovered. 

- John Dalton was an English chemist, physicist and meteorologist. He is best known for introducing the atomic theory into chemistry

287.

The maximum electron in N shell is?

A.

2

B.

8

C.

18

D.

32

Correct answer is D

The N shell is the fourth orbit with 32 max number of electrons using 2n2

288.

A sample of any of the following substances disappears after some time when exposed to air like camphor, naphthalene, or dry ice. This phenomenon is called?

A.

Sublimation

B.

Evaporation

C.

Diffusion

D.

Radiation

Correct answer is A

Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state.

Familiar substances that sublime readily include iodine, dry ice, menthol, and camphor.

289.

Oxygen is absent in?

A.

Kerosene

B.

Soil

C.

Glass

D.

Cement

Correct answer is A

Kerosene contains hydrocarbon with twelve to eighteen carbon atoms per molecule

290.

The gas which causes global warming is?

A.

O2

B.

CO2

C.

N2

D.

He

Correct answer is B

 Carbon dioxide, a colorless gas having a faint sharp odor and a sour taste. It is a greenhouse gas.

Global warming occurs when carbon dioxide (CO2) and other air pollutants collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth’s surface. Normally this radiation would escape into space, but these pollutants, which can last for years to centuries in the atmosphere, trap the heat and cause the planet to get hotter. These heat-trapping pollutants—specifically carbon dioxide, methane, nitrous oxide, water vapor, and synthetic fluorinated gases—are known as greenhouse gases, and their impact is called GREENHOUSE EFFECT