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.
I and II
I, II, and III
III and IV
all of the above
Correct answer is A
No explanation has been provided for this answer.
Which of the following is a non-metal that remains liquid at room temperature?
Chlorine
Phosphorus
Bromine
Helium
Correct answer is C
Bromine is a chemical element with the symbol Br and atomic number 35. It is the third-lightest halogen and is a volatile red-brown liquid at room temperature that evaporates readily to form a similarly coloured vapour.