Table of Contents
In this discussion, we will cover multiple-choice questions and key formulas, focusing on their relevance and importance from an exam perspective. MCQs are a common format in various assessments, often testing not only knowledge but also the ability to apply concepts efficiently. These questions require a deeper understanding of the subject matter, as they typically offer distractors designed to challenge the test-taker’s clarity and focus.
In addition to MCQs, we will be exploring essential formulas that form the core of solving problems in math, physics, and chemistry. A good grasp of these formulas is critical when solving numerically intensive questions. It is often at those times when applying the right formula at the right time that a significant difference can be made. We review the MCQs along with key formulas to ensure the skillful utilization of knowledge and to make students proficient in generating answers quickly, thereby improving speed and precision.
Lets Start
COMMON NAME- CHEMICAL NAME- CHEMICAL FORMULA
Limestone– Calcium Carbonate (CaCO3)
Quartz– Silicon Dioxide (Silica) (SiO2)
Milk of Magnesia– Magnesium Hydroxide (Mg(OH)2)
Caustic soda– Sodium hydroxide – (NaoH).
Potash alum –potassium Aluminium Sulphate – k2SO4AL2(SO4)3.24H2O
Rock salt- sodium chloride –(NaCL)
Saltpetre– Potassium Nitrate –(KNO3)
Wintergreen Oil- Methyl Salicylate- (C8H8O3)
Vermillion/ Cinnabar– -Mercuric Sulphide –(HgS)
Plaster of Paris – calcium sulphate -(CaSO4).1/2H2O
Mohr՚sSalt -Ammonium Ferrous SulphateFeSO4(NH4)2SO4.6H2O
Blue Vitriol -Copper Sulphate- (CuSO4.5H2O)
Baking Powder – Sodium Bicarbonate- (NaHCO3)
Washing Soda -Sodium Carbonate – (Na2CO3.10H2O)
Vinegar -acetic acid – (CH3COOH)
Litharge (Red) and Massicot (Yellow)
Lead (II) Oxide/ Lead Monoxide PbO
Dolomite-Calcium Magnesium Carbonate CaMg(CO3)
Glycerol Propane-1,2,3-triol-( C3H8O3)
Hematite Iron (III) Oxide/ Ferric Oxide (Fe2O3)
Aqua Fortis/ Spirit of Niter Nitric Acid (HNO3)
Chloroform- CHCl3
Trichloromethane Bromoform (CHBr3)
Iodoform – CHI3
CFC-12/ Freon-12 Dichlorodifluoromethane (CCl2F2).
Bleaching powder– Calcium Chlorohypo Chlorite Ca(ClO)2
Quick lime –calcium Oxide- CaO.
Aspirin -Acetylsalicylic Acid C9H8O4
Oil of vitriol – Sulphuric acid (H2SO4)
White Vitriol –Zinc Sulphate (ZnSO4)
Green Vitriol -Ferrous Sulphate FeSO4.7H20
Phosgene-Carboxyl Chloride -COCl2
Gypsum – calcium Sulphate Dihydrate -CaSO4. 2H2O
Methane -Marsh Gas-CH4
Slaked Lime Calcium Hydroxide -Ca(OH)2
Phenol – Carbolic Acid C6H6O
Laughing Gas: Nitrous Oxide – ( N2O)
Sand-Silicon Oxide – SiO2
Sugar – sucrose –C12H22O11
MCQs On Chemical Formula
Q1. The element which does not react with oxygen is?
a) Chlorine
b) Iodine
c) Helium
d) Hydrogen
Ans :C
Helium is the element that does not react with oxygen.
Helium is the least reactive element and is part of the noble gas group, which also includes neon, argon, krypton, xenon, and radon.
Q2. Name the type of following chemical reactions.
CuSo4 + H2S → CuS ↓ + H2SO4
a) Addition reaction
b) Decomposition reaction
c) Displacement reaction
d) Double Displacement reaction
Ans 😀
Q3. Calcium oxide reacts with water to produce slaked
lime. It is an example of?
a) Addition reaction
b) Decomposition reaction
c) Displacement reaction
d) Double Displacement
reaction
Ans : A
🔰Chemical reaction: CaO (calcium oxide) + H2O (water) → Ca(OH)2 (calcium hydroxide, also called slaked lime).
This reaction is exothermic, meaning it releases heat.
When calcium oxide reacts with water, it produces slaked lime (calcium
hydroxide).
Q4. Chemical formula of plaster of paris?
a) CaSO4
b) CaSO4.2H2O
c) CaSO4.1/2 H2O
d) CaSO4.H2O
Ans :C
The chemical name of plaster of paris is Calcium sulphate hemihydrate.
The chemical name of the plaster of Paris is calcium sulfate hemihydrate because half-molecule of water is attached with calcium sulphate.
Q5. Which of the following metals will not react with oxygen, even when heated very strongly in air?
a) Zinc
b) Aluminium
c) Silver
d) Iron
Ans : C
The metal that will not react with oxygen, even when heated very strongly in air, is silver (Ag).
Silver, along with gold, are considered “noble metals” and are very
unreactive, meaning they do not readily react with oxygen even at high temperatures.
Q6. Self-linking ability of carbon is called?
a) carbonation
b) sublimation
c) hydrogenation
d) catenation
Ans 😀
🔰Carbon has the unique ability to form bonds with other atoms of carbon,
giving rise to large molecules. This property is called catenation.”
Q7. Dead organisms are transformed into petroleum & natural gas in?
a) Absence of air
b) Presence of air
c) Presence of sun light
d) None of these
Ans :A
Dead organisms are transformed into petroleum and natural gas through a chemical process called anaerobic fermentation, which takes place under high temperatures and pressures in the absence of air:
Q8. Which are the Chemicals with characteristic odors commonly used in synthetic flavors, perfumes, and cosmetics?
a) Carboxylic Acid
b) Ester
c) Ketone
d) Aldehyde
Ans :B
Q9. What is the chemical name given of chalk?
a) Calcium Sulphate
b) Calcium Nitrate
c) Calcium Carbonate
d) Calcium Phosphide
Ans : C
The chemical name for chalk is calcium carbonate, and its chemical
formula is CaCO3.
Chalk is a sedimentary carbonate rock that’s made up of calcite, an ionic salt.
Q10. What is the chemical name of Galena?
a) Silver sulphide
b) Lead sulphide
c) Zinc sulphide
d) Ferrous sulphide
Ans : B
Galena is a lead ore with the chemical name lead sulfide and is sometimes called lead glance.
Galena has the chemical formula PbS.
The formula represents the presence of one lead (Pb) atom and one sulfur (S) atom.
Q11. The chemical substance which have a bitter taste is?
a) Base
b) Acid
c) Salt
d) None of these
Ans : A
Bases are a class of chemical substances that are bitter in taste and feel soapy when rubbed between the fingers.
Some examples of bases include: baking soda, toothpaste, and indigestion tablets.
Q12. Blood cells do not shrink in blood because blood is?
a) hypertonic
b) isotonic
c) equimolar
d) hypotonic
Ans :B
Blood is also an isotonic solution therefore blood cells don’t shrink in it.
When a blood cell is placed in a Hyper tonic solution, it shrinks as water is drawn out of the cell and into the surrounding solution. If it is placed in a Hypo tonic solution, the blood cell grows in size.
Q13. If OH group is attached to benzene ring, compound form is?
a) alcohol
b) alkyne
c) alkene
d) phenol
Ans 😀
If an OH group is attached to a benzene ring, the compound formed is
called a phenol.
Explanation: A phenol is characterized by a hydroxyl group (-OH) directly bonded to a carbon atom within an aromatic ring, like benzene.
Q14. Which of the following is a noble gas? a) Nitrogen
b) Oxygen
c) Argon
d) Carbon
Ans : C
Argon is a noble gas and belongs to Group 18 of the periodic table, known for its inert nature.
Q15. What is the pH value of a neutral solution?
a) 0
b) 7
c) 14
d) 5
Ans : B
A neutral solution has a pH value of 7, which is neither acidic nor basic.
Q16. Which of the following is a property of acids?
a) Bitter taste
b) Slippery feel
c) Turns blue litmus paper red
d) None of these
Ans : C
Acids are known for their ability to turn blue litmus paper red, indicating their acidic nature.
Q17. Which of the following is used as a fuel in rockets?
a) Hydrogen
b) Methane
c) Ammonia
d) Nitrogen
Ans : A
Hydrogen is widely used as rocket fuel due to its high energy content when burned with oxygen.
Q18. Which of the following is an example of a chemical change?
a) Melting of ice
b) Dissolving salt in water
c) Burning of paper
d) Cutting a piece of wood
Ans : C
Burning paper is a chemical change because it results in the formation of new substances.
Q19. Which of the following compounds is used as a bleaching agent?
a) Sodium chloride
b) Hydrogen peroxide
c) Ammonium chloride
d) Sodium hydroxide
Ans : B
Hydrogen peroxide is commonly used as a bleaching agent in laundry and hair treatments.
Q20. Which of the following is the correct formula for methane?
a) CH4
b) C2H6
c) CO2
d) C3H8
Ans : A
Methane is a simple organic compound with the chemical formula CH4.
Q21. Which of the following elements is most likely to form a cation?
a) Chlorine
b) Oxygen
c) Sodium
d) Nitrogen
Ans : C
Sodium (Na) is an alkali metal and tends to lose an electron to form a cation (Na+).
Q22. Which of the following is an example of a saturated hydrocarbon?
a) Butene
b) Ethylene
c) Methane
d) Benzene
Ans : C
Methane is a saturated hydrocarbon because it only contains single bonds between carbon atoms.
Q23. Which of the following is used as a refrigerant?
a) Ammonia
b) Helium
c) Nitrogen
d) Chlorofluorocarbons (CFCs)
Ans : D
CFCs are used in refrigeration and air conditioning systems due to their low boiling points.
Q24. What is the molecular formula of glucose?
a) C6H12O6
b) C6H10O6
c) C6H8O6
d) C6H14O6
Ans : A
Glucose has the molecular formula C6H12O6 and is a simple sugar used in energy metabolism.
Q25. Which of the following compounds is a strong acid?
a) Acetic acid
b) Sulfuric acid
c) Citric acid
d) Formic acid
Ans : B
Sulfuric acid (H2SO4) is a strong acid known for its corrosive properties.
Q26. The process of separating a solid from a liquid by passing the mixture through filter paper is called?
a) Distillation
b) Filtration
c) Evaporation
d) Condensation
Ans : B
Filtration is the process used to separate a solid from a liquid by passing the mixture through filter paper.
Q27. What is the formula of sodium bicarbonate?
a) Na2CO3
b) NaCl
c) NaHCO3
d) NaOH
Ans : C
Sodium bicarbonate is commonly known as baking soda and has the formula NaHCO3.
Q28. Which of the following is an example of a physical change?
a) Rusting of iron
b) Boiling of water
c) Digestion of food
d) Burning of wood
Ans : B
Boiling water is a physical change because the water remains chemically the same, only changing from liquid to gas.
Q29. Which gas is released when an acid reacts with a metal?
a) Hydrogen
b) Oxygen
c) Nitrogen
d) Carbon dioxide
Ans : A
Hydrogen gas is released when an acid reacts with a metal, such as when hydrochloric acid reacts with zinc.
Q30. The atomic number of an element is defined as the number of?
a) Neutrons
b) Protons
c) Electrons
d) Protons and electrons
Ans : B
The atomic number of an element is the number of protons in its nucleus, which determines the element’s identity.
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