50+ Best Chemistry Questions And Answers 2023

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Chemistry is one of my favorite subjects and this is the reason why I am doing my major in chemistry. Not all people enjoy this subject but for some people, it’s one of the most interesting subjects to learn. If you are here then there is a possibility that chemistry is your favorite subject too and you just can’t get enough of it! But we are also keeping an open mind and welcome those who don’t enjoy this subject so much.
Chemistry is not only one of the interesting or fun subjects but it is also one of the most important subjects that you are asked about in the competitive exams. So even if chemistry was the worst subject for you, you have to study it to clear some of the competitive exams.
So to help you with this subject, we have listed some of the best and most asked chemistry questions and answers which will help you a bit. So let’s go ahead and take a look at the following chemistry questions and answers to help yourself with this subject or to simply test your knowledge of the subject.
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 Chemistry Questions

  • Are two atoms of the same element identical?
  • Can water stay liquid below zero degrees Celsius?
  • Can you light diamond on fire?
  • How bad of an alcoholic do you have to be to have your brain affected?
  • How can glass be a liquid if it’s so hard?
  • How do I know if something is an acid so I can avoid eating it?
  • How do plants get their nitrogen from the air?
  • How does dissolving a salt molecule in water make its atoms ionize?
  • How does plasma make a campfire flame orange?
  • How does tomato juice make skunk smell go away?
  • What is it about the ocean that makes it look blue when it reflects the sky?
  • What is the difference between a chemical process and a physical process in chemistry?
  • What kind of crystal are crystal drinking glasses made out of?
  • What made the hole in the ozone go away?
  • What makes a “fluorescent” highlighter marker so bright?
  • When does the breaking of chemical bonds release energy?
  • When hang-drying clothes, which is faster, indoors or outdoors?
  • Which sunscreens are chemical-free?
  • Why are crystals rare?
  • Why are there so many different kinds of forces in chemistry?
  • Why do atoms always contain the same number of electrons and protons?
  • Why doesn’t the planet Uranus explode if it contains so much hydrogen and methane?
  • Why don’t metals burn?
  • Why don’t objects fuse to my finger when I touch them?
  • Why is ice slippery?
  • Why is lead used in pencils even though lead is poisonous?
  • Why is mass conserved in chemical reactions?
  • Why is plastic not used in home construction?
  • Why is propane stored in household tanks but natural gas is not?

  Basic chemistry Questions And Answers

Acid rain is formed due to contribution from the following pair of gases –
1) Methane and ozone
2) Oxygen and nitrous oxide
3) Methane and sulpher dioxide
4) Carbon dioxide and sulpher dioxide
The concentration of which gas is highest in our environment ?
1) Oxygen
2) Hydrogen
3) Nitrogen
4) Carbon dioxide
Air is composed of gases, water vapours and –
1) dust particles
2) rainfall
3) snowfall
4) light
Which of the following is in liquid form at room temperature ?
1) Lithium
2) Sodium
3) Francium
4) Cerium
What is agent Orange?
1) An ace spying group trained by the police in London
2) A weed-killing chemical used by the US military in the Vietnam War
3) A technique used in the advanced railway safety procedure
4) A special chemical used in making alloy steel
pH value for alkaline solution is always –
1) 7
2) less than 7
3) more than 7
4) None of the above
Which one of the following Black materials has highest carbon content?
1) Charcoal
2) Coal
3) Coke
4) Lampblack
Which state of Cr is most toxic?
1) Cr4+
2) Cr5+
3) Cr6+
4) Cr3+
Hardness of water is due to the presence of –
1) Sodium and chloride ions
2) Calcium and Magnesium ions
3) Strontium and Potassium ions
4) Potassium and Nitrate ions
Which of the following gases in the atmosphere does not fall under the category of ‘Greenhouse gases’ ?
1) Water vapour
2) CO2
3) CFC
4) O3

 Hard Chemistry Questions

  • What Is an Acid?
  • What Are Atoms?
  • What Is the Periodic Table?
  • What Is the Reactivity Series?
  • How Do Glow Sticks Glow?
  • How Do You Get Different Coloured Fireworks?
  • What Is an Alloy?
  • How Does a Match Light?
  • How Does the Mentoes/Coke Explosion Work?
  • What is the Ozone Layer?

 Chemistry Questions And Answers for High school

Which quantum number gives the shape of the orbital?
Answer: Azimuthal quantum number.
What is the maximum capacity of d-orbital?
Answer: 10 electrons.
What is the shape of s-orbital?
Answer: Spherical.
What do you mean by Zeeman Effect?
Answer: Splitting of spectral lines by magnetic field.
What is the shape of p-orbital?
Answer: Dumb-bell.
Which series of hydrogen atomic spectrum lies in the visible region?
Answer: Balmer series.
Who proposed elliptical orbits?
Answer: Sommerfeld.
How many atomic orbitals are known? What are they?
Answer: Four. S, p, d, and f.
What is the maximum number of electrons that can be accommodated in an orbital?
Answer: 2.
How many orbitals present 5f subshell?
Answer: Seven.
On which property of electrons does the electron microscope work?
Answer: Wave nature.
The element with the minimum atomic number having 8 electrons in the outer most shell is what?
Answer: Neon.
The s-orbital of the L shell is represented as what?
Answer: 2s.
The major shell-wise electronic configuration of element with the atomic number 15 is what?
Answer: 2, 8, 5
Who put forward the principle of uncertainty?
Answer: Werner Heisenberg.
When electron leaves an orbital and jumps in to another?
Answer: When its energy changes.
The electronic configuration of an atom is 2, 8, and 2. What is its atomic number?
Answer: 12.
What do you mean by orbitals?
Answer: They are regions of space around the nucleus where the probability of finding an electron is maximum.
What are the integers used to express the energy, posit, etc. of an electron?
Answer: Quantum numbers.
The steady state from which no spontaneous change takes place is called what?
Answer: Equilibrium.
What is the color of ammonium chloride?
Answer: White.
The chemical reactions which never go to completion are called what?
Answer: Reversible reactions.
In the manufacture of ammonia from hydrogen and nitrogen the pressure used is.
Answer: Very high.
The process of manufacture of Sulfuric acid is named as what?
Answer: Contact process.
What is the color of ferric thiocyanate?
Answer: Deep red or blood red.
What is known as a system of reacting substances in which the concentrations of reactants and product do not undergo any change?
Answer: Chemical equilibrium.
What is dissociation?
Answer: Reversible decomposition is called dissociation.
What is the color of Phenolphthalein in sodium hydroxide solution?
Answer: Pink.
Which substance obtained on cooling the vapor produced on heating ammonium chloride?
Answer: Ammonium chloride.
When temperature is decreased the speed of the reaction increases. Which was the action?
Answer: Exothermic.
Write an example of an irreversible reaction.
Answer: The neutralization of sodium hydroxide with hydrochloric acid.
A factor which is unable to alter the equilibrium state of reactions in which only solids or liquids are present is?
Answer: Pressure.
Chemical equilibrium is said to be dynamic in nature. Why?
Answer: Because even after reaching equilibrium forward and backward reactions are taking place at the same rate.
What must be constant for the system to reach equilibrium?
Answer: Temperature.
What do you understand by chemical equilibrium?
Answer: The stat of a system of reacting substances in which the concentration does not change is called chemical equilibrium.
What are the factors affecting the chemical equilibrium?
Answer: The changes in the concentration, temperature, or pressure affect the equilibrium.
Name the reactant used in excess in contact process?
Answer: Air.
What is the pressure used in the manufacture of ammonia?
Answer: 1000 atmospheres.
What is the optimum temperature in the manufacture of ammonia?
Answer: 500° C.
Name the scientist who described about reactions that go forward and backward.
Answer: Berthollet.
What is the color of solution obtained when hydrolysis of ferric chloride takes place?
Answer: Chocolate.
What is the name of process used for manufacturing ammonia direct from Nitrogen and hydrogen elements?
Answer: Haber process.
What accelerate the forward and backward reactions equally in a reversible reaction?
Answer: Catalyst.
What happens if a reversible reaction continues for a long time as a closed system?
Answer: Both the reactions continue at the same speed.
Which is the most suitable temperature for the production of sulfur trioxide from sulfur dioxide and oxygen?
Answer: 450° C.

Conclusion –

So these are some of the most asked chemistry questions and their answers and we hope this was helpful for you. We have tried to include all kinds of chemistry questions and answers which would certainly help you get a knowledge of the subject. You can also take the questions to ask your colleagues or classmates just for the sake of revision. We hope you like our article and found it helpful as well.

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