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.
The maximum electron in N shell is?
2
8
18
32
Correct answer is D
The N shell is the fourth orbit with 32 max number of electrons using 2n\(^2\)
Sublimation
Evaporation
Diffusion
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.
Kerosene
Soil
Glass
Cement
Correct answer is A
Kerosene contains hydrocarbon with twelve to eighteen carbon atoms per molecule
The gas which causes global warming is?
O\(_{2}\)
CO\(_{2}\)
N\(_{2}\)
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
The atomic weight of nitrogen is?
10
12
14
16
Correct answer is C
Atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element's atoms to some standard.