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Practice MCQ Questions and answers on Chemistry-GK

Learn and practice General Knowledge questions and answers on Chemistry with very easy and understandable explanations. GK questions are very helpful different type of competitive exams.

Each section contains 100 MCQs on Chemistry .
1
Which of the following phenomenon is considered responsible for Global Warming?
Discuss
Answer & Solution
Answer: Option A
Solution:
The Greenhouse effect is the main thing that causes global warming.
It's like a blanket around the Earth.
Certain gases in the atmosphere (like carbon dioxide) trap heat from the sun.
Normally, some of this heat would escape back into space.
But, when we burn too much fuel (like coal, oil, and gas), we release more of these gases.
This makes the "blanket" thicker, trapping more heat and warming the planet.

Let's look at why the other options are wrong:

B) Fire in coal mines: While coal mine fires are bad for the environment, they don't cause global warming directly on a global scale like the greenhouse effect.

C) Dry farming: Dry farming is a method of farming in dry areas. It can have environmental impacts, but it's not a direct cause of global warming.

D) Monsoon: Monsoon are seasonal winds and rain. They are part of the Earth's climate system, but they don't cause global warming itself. In fact, climate change and global warming can affect monsoon patterns.

E) Trade winds: Trade winds are constant winds in the tropics. Like monsoon, they are part of Earth's climate, not a cause of global warming.

So, the greenhouse effect is the most important thing to understand when talking about global warming!
2
The nucleus of an atom consists of
Discuss
Answer & Solution
Answer: Option C
Solution:
The nucleus of an atom consists of protons and neutrons.
3
The number of moles of solute present in 1 kg of a solvent is called its
Discuss
Answer & Solution
Answer: Option A
Solution:
Molality is the property of a a solution that is defined as the number of moles of solute per kilogram of solvent.
4
The most electronegative element among the following is
Discuss
Answer & Solution
Answer: Option C
Solution:
Fluorine is the most electronegative element and also the most reactive non-metal.
5
The metal used to recover copper from a solution of copper sulphate is
Discuss
Answer & Solution
Answer: Option D
Solution:
The metal used to recover copper from a solution of copper sulphate is Fe.
6
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
Discuss
Answer & Solution
Answer: Option D
Solution:
The number of d-electrons in Fe2+ (Z=26) is not equal to the number of p - electrons in Cl(Z=17).
7
The metallurgical process in which a metal is obtained in a fused state is called
Discuss
Answer & Solution
Answer: Option A
Solution:
The process of extraction of metal in its molten state by any reducing agent in the presence of flux is called smelting.
8
The molecules of which gas have highest speed?
Discuss
Answer & Solution
Answer: Option A
Solution:
Among the given gases, hydrogen at −50oC has maximum value of T/M and highest speed.
9
The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called
Discuss
Answer & Solution
Answer: Option C
Solution:
The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called igneous rocks.
10
The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is
Discuss
Answer & Solution
Answer: Option C
Solution:
In physical chemistry, Henry's law is a gas law that states that the amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid. The proportionality factor is called Henry's law constant.