Chemistry GK MCQs for Competitive Exams for free online practice. Collection of Important previous year questions for preparation of upcoming SSC,RRB examinations.
Chemistry GK MCQs
Question 1: Which of the following dietary components provides the maximum energy per gram to humans?
A) Carbohydrates
B) Fats
C) Fibers
D) Proteins
Question 2: Which of the following is a noble gas?
A) Ozone
B) Nitrogen
C) Hydrogen
D) Helium
Question 3: Which of the following elements belongs to the d-block of the modern periodic table?
A) Na
B) Fe
C) Ca
D) Mg
Question 4: According to the modern periodic table, which element has the atomic number 30?
A) Co
B) Ni
C) Zn
D) Fe
Question 5: Which iron ore contains the highest amount of iron?
A) Magnetite
B) Hematite
C) Limonite
D) Siderite
Question 6: Who was awarded the Nobel Prize for the discovery of the neutron?
A) Chadwick
B) Rutherford
C) Niels Bohr
D) Roentgen
Question 7: What is the chemical name of Plaster of Paris?
A) Calcium hypochlorite
B) Calcium carbonate
C) Calcium oxide
D) Calcium sulfate hemihydrate
Question 8: What is the chemical formula of washing soda?
A) Na2SO4
B) Ca(OH)2
C) Na2CO3 . 10H2O
D) NaHCO3
Question 9: In a water molecule, what is the ratio of the masses of hydrogen and oxygen?
A) 1:4
B) 1:8
C) 1:16
D) 1:2
Question 10: α particles are doubly charged ions of ____________.
A) Beryllium
B) Hydrogen
C) Helium
D) Lithium
Question 11: What is the atomic number of Copper?
A) 29
B) 26
C) 30
D) 32
Question 12: What is the most common isotope of Oxygen?
A) O-16
B) O-17
C) O-18
D) O-19
Question 13: What is the chemical name of NH₃ (Ammonia)?
A) Nitrogen Trihydride
B) Hydrogen Nitride
C) Nitrogen Hydride
D) Hydrogen Trinitride
Question 14: What is the chemical symbol for Mercury?
A) Hg
B) Pb
C) Au
D) Ag
Question 15: Which acid is a harmful enzyme?
A) Hydrochloric Acid
B) Sulfuric Acid
C) Nitric Acid
D) Hydrofluoric Acid
Question 16: What is the approximate pH value of water?
A) 1
B) 7
C) 14
D) 9
Question 17: Which element exhibits metallic properties?
A) Hydrogen
B) Oxygen
C) Calcium
D) Sulfur
Question 18: Which chemical is a strong acid?
A) Ethanol
B) Acetic Acid
C) Sulfuric Acid
D) Ammonia
Question 19: What is formed when carbon dioxide (CO₂) dissolves in water?
A) Carbonic Acid
B) Hydrochloric Acid
C) Sulfuric Acid
D) Nitric Acid
Question 20: Which element has the highest relative atomic mass?
A) Hydrogen
B) Helium
C) Lithium
D) Uranium
Question 21: Which element remains in a gaseous state at room temperature?
A) Iron
B) Sodium
C) Nitrogen
D) Gold
Question 22: Which metal is the lightest?
A) Lithium
B) Sodium
C) Potassium
D) Magnesium
Question 23: What is formed when hydrochloric acid and ammonia react?
A) Ammonium Chloride
B) Ammonium Hydroxide
C) Hydrogen Chloride
D) Hydrochloric Acid
Question 24: In chemistry, what does ‘pH’ stand for?
A) Measurement of acidity
B) Measurement of basicity
C) Measurement of gaseous state
D) Measurement of solid state
Question 25: Which acid is a natural acid found in fruits?
A) Sulfuric Acid
B) Acetic Acid
C) Citric Acid
D) Hydrochloric Acid
Question 26: Which element has only one electron in its outer shell?
A) Helium
B) Hydrogen
C) Lithium
D) Boron
Question 27: What is the atomic number of Iron (Fe)?
A) 20
B) 26
C) 29
D) 32
Question 28: What is the chemical symbol for Silver?
A) Ag
B) Au
C) Pb
D) Hg
Question 29: Which element is commonly found as a diatomic molecule?
A) Hydrogen
B) Sodium
C) Calcium
D) Iron
Question 30: Which gas is produced during the oxidation and burning of water?
A) Oxygen
B) Hydrogen
C) Nitrogen
D) Carbon Dioxide
Question 31: Which acid is predominant in acid rain?
A) Hydrochloric acid
B) Sulfuric acid
C) Citric acid
D) Acetic acid
Question 32: Which chemical is used as a pesticide?
A) Cysteine
B) Chloroform
C) DDT
D) Aniline
Question 33: Which is the most abundant element in the atmosphere?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Argon
Question 34: Which element is most commonly used as a salt?
A) Sodium
B) Calcium
C) Potassium
D) Iron
Question 35: What compound is formed by the combination of oxygen and hydrogen?
A) Methane
B) Ammonia
C) Water
D) Carbon dioxide
Question 36: Which element is used in the production of atomic bombs?
A) Plutonium
B) Sodium
C) Boron
D) Magnesium
Question 37: Which substance is used to clean teeth?
A) Calcium carbonate
B) Sodium chloride
C) Silica
D) Glycerine
Question 38: Which substance is called ‘white poison’ in the diet?
A) Salt
B) Sugar
C) Sodium bicarbonate
D) Calcium
Question 39: Which chemical is used to preserve food?
A) Acetic acid
B) Sulfur dioxide
C) Hydrochloric acid
D) Nitric acid
Question 40: Which substance is a good conductor of electricity?
A) Wood
B) Plastic
C) Copper
D) Rubber
Question 41: Which compound is found in oily color?
A) Carbon dioxide
B) Potassium permanganate
C) Water
D) Sodium chloride
Question 42: What is the chemical symbol of Helium?
A) He
B) H
C) Hg
D) H₂
Question 43: Which chemical is used to extinguish fire?
A) Carbon dioxide
B) Hydrogen
C) Ammonia
D) Sulfur
Question 44: Which element plays a significant role in DNA as an important biomolecule?
A) Carbon
B) Hydrogen
C) Nitrogen
D) Oxygen
Question 45: Which element is used in radiotherapy?
A) Iodine
B) Sodium
C) Boron
D) Calcium
Question 46: Which chemical is used in burning and also found in fireworks?
A) Nitrogen
B) Potassium nitrate
C) Sodium chloride
D) Hydrochloric acid
Question 47: Which color indicator is used to identify acidic properties?
A) Red
B) Blue
C) Green
D) Yellow
Question 48: Which substance dissolves in water but not in oil?
A) Salt
B) Sugar
C) Flour
D) Fat
Question 49: What is the most common example of a hydrogen bond?
A) Ammonia
B) Water
C) Carbon dioxide
D) Methane
Question 50: Which element is used in batteries?
A) Lithium
B) Sodium
C) Calcium
D) Potassium
Question 51: Which element is used in making steel?
A) Carbon
B) Silicon
C) Zinc
D) Platinum
Question 52: Which element plays an important role in biological instruments?
A) Iron
B) Sodium
C) Calcium
D) Gold
Question 53: Which metal is used in galvanization to protect iron from corrosion and rust?
A) Chromium
B) Zinc
C) Rhodium
D) Tin
Question 54: Bronze is an alloy of which of the following?
A) Copper and Zinc
B) Tin and Zinc
C) Copper and Tin
D) Iron and Zinc
Question 55: What is the bond called when electrons are shared between two elements?
A) Covalent bond
B) Hydrogen bond
C) Ionic bond
D) Dative bond
Question 56: The isotope of which element is used in cancer treatment?
A) Cobalt
B) Nickel
C) Aluminum
D) Iron
Question 57: A naturally occurring organic compound with the formula (C6H5)2CO is?
A) Acetophenone
B) Benzophenone
C) Propiophenone
D) Methcathinone
Question 58: What is the atomic mass of sodium?
A) 13
B) 23
C) 40
D) 12
Question 59: Which gas is produced when lead nitrate is heated?
A) Nitrogen dioxide
B) Lead dioxide
C) Lead oxide
D) Nitrogen oxide
Question 60: Which chemical element from group 18 of the periodic table is produced in soil and rocks due to the natural radioactive decay of uranium?
A) Radon
B) Neon
C) Krypton
D) Oganesson