Chemistry – Objective GK Questions for Competitive Exams – Chemistry GK

Oct 21, 2023   By Rohini

Are you feeling that the Chemistry Subject is Difficult? Most of the students reply that Yes!! But, from now onwards, you have to change your opinion. It’s all because of the Magic of the Chemistry which combines a number of different sciences. If you wish to view each and every aspect in a practical way, then one must have to choose Chemistry over Science. We are living in a Complicated world where everything goes on practical. So, from now onwards try to visualize everything from the chemistry point of view. Our recruitment.guru has collected the Chemistry Questions and answers with Explanation. Try to read the Chemistry Questions Answers and make the Chemistry Notes out of them.

Basic General Knowledge of Chemistry pdf

It is just a matter of seconds to start the Online Chemistry Quiz. But the most important task lies in remembering the  Chemistry Questions Answers at the time of the exam. Try to practice the Online chemistry quiz just as a fun task. So, you will be able to cope with the Chemistry Subject. Candidates can get the Chemistry GK in Hindi, Chemistry Objective Questions for Competitive Exams also.

What is chemistry?

  • When you hear the word ‘chemistry,’ there are likely certain images that come to mind – molecules, test tubes, the periodic table, maybe even some cool explosions in a movie.
  • But chemistry is so much more than these things! In fact, chemistry is known as the central science because it touches all other natural sciences, like biology, physics, geology, and more.
  • Chemistry is a physical science, and it is the study of the properties of and interactions between matter and energy.
  • In other words, chemistry is a way to study the properties, characteristics, and physical and chemical changes of matter.
  • The matter is pretty important because it’s anything that has mass and takes up space – basically, all of the ‘stuff’ that makes up our world.
  • Chemists study atoms, which are the basic building blocks of matter, as well as interactions between atoms.

Branches of Chemistry

Chemistry exists whether we define it or not. And because an understanding of chemistry is so vital in so many other scientific fields, there are several different branches of chemistry that exist. In fact, chemistry is often studied so that scientists can better understand their own field.

There are five main branches of chemistry, each of which has many areas of study.

Analytical chemistry

  • Analytical chemistry uses qualitative and quantitative observation to identify and measure the physical and chemical properties of substances. In a sense, all chemistry is analytical.

Physical chemistry

  • The Physical chemistry combines chemistry with physics.
  • Physical chemists study how matter and energy interact.
  • Thermodynamics and quantum mechanics are two of the important branches of physical chemistry.

Organic chemistry

  • Organic chemistry specifically studies compounds that contain the element carbon.
  • Carbon has many unique properties that allow it to form complex chemical bonds and very large molecules.
  • Organic chemistry is known as the “Chemistry of Life” because all of the molecules that make up living tissue have carbon as part of their makeup.

Inorganic chemistry

  • Inorganic chemistry studies materials such as metals and gases that do not have carbon as part of their makeup.

Biochemistry

Biochemistry is the study of chemical processes that occur within living organisms.

Periodic Table

s, p, d, f, g block Elements

 

General Configuration of elements

s Block elements

  • s-block elements included the elements of group 1 and group 2 of the periodic table.
  • s block elements are metals.
  • The elements of group I & II receive their last electron in s-orbital. So they are called as s – block elements.
  • Most s-block elements are highly reactive metals due to the ease with which their outer s-orbital electrons interact to form compounds
  • The metals Lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs) and francium (Fr) which have one electron in their outermost shell belongs to group I.
  • They are called alkali metals as they react with water to form hydroxides which are strong bases or alkalies.
  • Hydrogen is highly chemically reactive, like the other s-block elements, but helium is a virtually unreactive noble gas.

p Block elements

  • The p – block elements include the elements of group 13, 14, 15, 16, 17 and 18.
  • p block elements are mainly non-metals.
  • p-block metals have classic metal characteristics: they are shiny, they are good conductors of heat and electricity, and they lose electrons easily.
  • Of the p-block metals, several have fascinating properties.
  • Gallium, in the 3rd row of column 13, is a metal that can melt in the palm of a hand.
  • Tin, in the fourth row of column 14, is an abundant, flexible, and extremely useful metal.

d block elements

    • The d-block is in the middle of the periodic table and includes elements from columns 3 through 12.
    • These elements are also known as the transition metals because they show transitivity in their properties.
    • The d-block elements are all metals which exhibit two or more ways of forming chemical bonds.
    • The d-orbitals can contain up to five pairs of electrons.
    • d-orbitals can contain up to five pairs of electrons

f block elements

  • The f-block is in the centre-left of a 32-column periodic table but in the footnoted appendage of 18-column tables.
  • These elements are not generally considered as part of any group.
  • They are often called inner transition metals because they provide a transition between the s-block and d-block in the 6th and 7th row.
  • The known f-block elements come in two series, the lanthanides of period 6 and the radioactive actinides of period 7.
  • The f-orbitals can contain up to seven pairs of electrons.

g block elements

  • The g-block is a hypothetical block of elements in the extended periodic table.
  • The outermost electrons are posited to have one or more g-orbital electrons.
  • The elements do not have f-, d- or p-orbital electrons.

Chemical Bonds

Why atoms form chemical bonds?

  • The basic answer is that atoms are trying to reach the most stable (lowest-energy) state that they can.
  • Many atoms become stable when their valence shell is filled with electrons.
  • If atoms don’t have this arrangement, they will reach it by gaining, losing, or sharing electrons via bonds.

Types of Bonds

They are 4 types of Bonds

  • Ionic Bond
  • Covalent Bond
  • Polar Bond
  • Hydrogen Bond

Ionic Bond

  • Ionic bonding involves a transfer of an electron, so one atom gains an electron while one atom loses an electron.
  • One of the resulting ions carries a negative charge (anion), and the other ion carries a positive charge (cation).
  • Because opposite charges attract, the atoms bond together to form a molecule.

Covalent Bond

  • The most common bond in organic molecules, a covalent bond involves the sharing of electrons between two atoms.
  • The pair of shared electrons form a new orbit that extends around the nuclei of both atoms, producing a molecule.
  • here are two secondary types of covalent bonds that are relevant to biology known as polar bonds and hydrogen bonds.

Polar Bond

  • Polar bond forms when two atoms connected by a covalent bond may exert different attractions for the electrons in the bond, producing an unevenly distributed charge.
  • Water is an example of a polar molecule.

Hydrogen Bond

  • Two adjacent H2O (water) molecules can form a linkage known as a hydrogen bond when they polarize.

Important Chemistry Chemical name and Formula – Chemistry GK Quiz

Chemical nameChemical formulaCommon name
Acetic acidCH3COOH + H2O5% Solution: White vinegar
AcetoneCH3COCH3Acetone
Acetylsalicylic acidC9H8O4Aspirin
Aluminum hydroxideAl(OH)3alumina hydrate
Ammonium bi-fluorideNH4HF2Ammonium hydrogen fluoride
Ammonium bromideNH4Br
Ammonium phosphate(NH4)3PO4Fertilizer
Ammonium sulfate(NH4)2SO4
Amylose(C6H9O5)nCornstarch
Ascorbic acidC6H8O6Vitamin C
barium sulfateBaSO4Lithopone
bismuth subsalicylateC7H5BiO4Pepto-Bismol
boric acidH3BO3Ant/Roach Killer, boracic acid
bromthymol blueC27H28Br2O5SpH Test
butaneC4H10Butane
caffeineC8H10N4O2No-Doz
calcium carbonateCaCO3Limestone, Carbonate of Lime
calcium chlorideCaCl2Laundry Aid/Road Salt/De-Icer
calcium hydroxideCa(OH)2Slaked Lime, garden lime
calcium hypochloriteCa(ClO)2
calcium sulphate, hemihydrateCaSO4·1/2H20Plaster of Paris

General Knowledge Questions on Chemistry

Chemical Name FormulaCommon Name
camphorC10H16O
carbonCSoot, Graphite, Graphene, Carbon nanotubes, Fullerenes, Diamond, Charcoal
carbon dioxideCO2
carbonic acidH2CO3
carrageenan
chromium oxideCr2O3Chrome Green
citric acidC6H8O7Sour Salt
copperCu
copper naphthenateCu(C11H10O2)2cupric naphthenate
cyanuric acidC3H3N3O3isocyanuric acid
dichloromethaneCH2Cl2methylene chloride
dimethyl sulfoxide(CH3)2SODMSO
ethanol/ethyl alcoholC2H5OHEverclear

Chemistry Questions and Answers – Basic Chemistry Questions Answers MCQ

  • Main gas in the air we breathe – Nitrogen (around 78%).
  • Acids have a pH level below 7.
  • The first element on the periodic table is Hydrogen
  • Center of an atom – A Nucleus
  • Famous New Zealand scientist Ernest Rutherford won Nobel Prize in Chemistry.
  • K is the chemical symbol of Potassium
  • Electrons orbit the nucleus of an atom

Chemistry Questions Answers MCQ

  • At room temperature, Mercury is the only metal that is in liquid form.
  • A nuclear reaction where the nucleus of an atom splits into smaller parts is known as nuclear fission.
  • A neutron has no net electric charge.
  • Argon (around 1%) is the third most common gas found in the air we breathe?
  • Reactants is the name given to substances that are initially involved in a chemical reaction.
  • Atoms of the same chemical element that have different atomic mass are known as Isotopes.
  • A proton carries a positive charge.
  • Sodium hydroxide (NaOH) is a base.
  • Carbon is the fourth most abundant element in the universe in terms of mass.

Chemistry Questions and answers with Explanation

  • Horizontal rows in the periodic table are Periods.
  • In Periodic table vertical columns are called Groups.
  • Alkali metals belong to Group 1 group in the periodic table.
  • Alkali metals are reactive metals.
  • Unreactive non-metals are Noble gases.
  • Group 0 elements are Unreactive non-metals.
  • The number of Electrons is equal to the number of Protons in its nucleus.
  • Ions are charged particles that form when atoms Lose or gains electrons.
  • The atoms in a molecule are joined together by the Covalent bond.
  • Reactive metals are extracted by Electrolysis.

Chemistry Questions Answers, Chemistry Notes

Do you want to look into topics such as organic chemistry, atoms, reactions, acids, and bases? Here is the best guide which will teach you regarding Organic Chemistry. Our site is the best destination for the students who wish to gain Knowledge regarding Chemistry. Practice Free online Chemistry Quiz to analyze what you have learned.  Even if you think you’re already an expert, then just practice the online Basic Chemistry Quiz and analyze where you stand regarding the subject knowledge.

Chemistry Questions and Answers PDF

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Chemistry-free practice questions – Chemistry General Knowledge Questions

  • Father of modern chemistry – Lavoisier.
  • Citric acid is present in lemon.
  • Rare gases are monoatomic.
  • The term PVC used in the plastic industry stands for polyvinyl chloride.
  • Oil of vitriol is sulphuric acid.
  • Glycerol is used in the preparation of dynamite.
  • Gypsum salt is Calcium sulphate.
  • Bleaching action of chlorine is by decomposition.
  • Gunpowder is a mixture of potassium nitrate powdered charcoal and sulphur.
  • Nail polish remover contains acetone.
  • The isotope atoms differ in the number of neutrons.

Practice Online Chemistry Quiz

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