MCAT / MDCAT Practice Test
Instructions:
- Select the correct option for each question.
- The answers to the following MCQs can be viewed by clicking here. The answer key will open in a separate window.
B. Chemistry Section
- The atomic number of an element represents:
A. Number of neutrons
B. Number of electrons and neutrons
C. Number of protons
D. Atomic mass - Which particle has no charge?
A. Proton
B. Electron
C. Neutron
D. Positron - The maximum number of electrons that can be accommodated in the second shell is:
A. 2
B. 8
C. 18
D. 32 - Isotopes of an element differ in:
A. Number of protons
B. Number of electrons
C. Number of neutrons
D. Atomic number - The bond formed by sharing electrons is called:
A. Ionic bond
B. Metallic bond
C. Covalent bond
D. Hydrogen bond - Which of the following is an ionic compound?
A. H₂O
B. CO₂
C. NaCl
D. NH₃ - Avogadro’s number is:
A. 6.02 × 10²²
B. 6.02 × 10²³
C. 3.01 × 10²³
D. 9.11 × 10³¹ - The pH of a neutral solution is:
A. 0
B. 14
C. 7
D. 1 - Which acid is present in gastric juice?
A. Sulfuric acid
B. Nitric acid
C. Hydrochloric acid
D. Acetic acid - The molecular formula of glucose is:
A. C₆H₁₂O₆
B. CH₄
C. C₂H₅OH
D. H₂SO₄ - Which gas is evolved when acids react with metals?
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Carbon dioxide - The SI unit of pressure is:
A. Joule
B. Pascal
C. Newton
D. Watt - Which law states that volume is inversely proportional to pressure?
A. Charles’ law
B. Boyle’s law
C. Gay-Lussac’s law
D. Avogadro’s law - Which element is present in all organic compounds?
A. Oxygen
B. Nitrogen
C. Carbon
D. Hydrogen - The process of loss of electrons is called:
A. Reduction
B. Oxidation
C. Neutralization
D. Hydrolysis - Which of the following is a strong acid?
A. Acetic acid
B. Carbonic acid
C. Hydrochloric acid
D. Formic acid - The shape of methane molecule is:
A. Linear
B. Trigonal planar
C. Tetrahedral
D. Bent - The empirical formula of benzene is:
A. CH
B. C₆H₆
C. CH₂
D. C₂H₂ - Which of the following is an alkali metal?
A. Calcium
B. Sodium
C. Magnesium
D. Aluminum - The process of converting solid directly into gas is called:
A. Condensation
B. Sublimation
C. Evaporation
D. Freezing - The atomic mass unit is defined as:
A. Mass of one proton
B. 1/16th mass of oxygen atom
C. 1/12th mass of carbon-12 atom
D. Mass of one electron - Which orbital has a dumbbell shape?
A. s-orbital
B. p-orbital
C. d-orbital
D. f-orbital - The valency of oxygen is:
A. 1
B. 2
C. 3
D. 4 - Which of the following has the highest electronegativity?
A. Fluorine
B. Chlorine
C. Oxygen
D. Nitrogen - The number of moles in 18 g of water is:
A. 0.5
B. 1
C. 2
D. 18 - Which gas is known as laughing gas?
A. NO
B. NO₂
C. N₂O
D. NH₃ - The catalyst used in the Haber process is:
A. Platinum
B. Iron
C. Nickel
D. Copper - Which of the following is a greenhouse gas?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Helium - Rusting of iron requires:
A. Water only
B. Oxygen only
C. Water and oxygen
D. Nitrogen and oxygen - Which of the following is an example of an exothermic reaction?
A. Photosynthesis
B. Respiration
C. Melting of ice
D. Evaporation - The formula of sulfuric acid is:
A. HCl
B. HNO₃
C. H₂SO₄
D. CH₃COOH - The gas collected over water should be:
A. Highly soluble in water
B. Insoluble in water
C. Reactive with water
D. Acidic - Which metal is liquid at room temperature?
A. Sodium
B. Mercury
C. Zinc
D. Iron - The pH of an acidic solution is:
A. Greater than 7
B. Equal to 7
C. Less than 7
D. Equal to 14 - Which of the following is a noble gas?
A. Chlorine
B. Nitrogen
C. Neon
D. Hydrogen - The process of gaining electrons is called:
A. Oxidation
B. Reduction
C. Sublimation
D. Combustion - Which of the following is used in dry cells?
A. Sodium chloride
B. Ammonium chloride
C. Potassium nitrate
D. Calcium carbonate - The lightest element is:
A. Helium
B. Lithium
C. Hydrogen
D. Oxygen - Which vitamin contains cobalt?
A. Vitamin A
B. Vitamin B₁₂
C. Vitamin C
D. Vitamin D - The boiling point of water at standard pressure is:
A. 50°C
B. 75°C
C. 100°C
D. 120°C - Which of the following is an unsaturated hydrocarbon?
A. Methane
B. Ethane
C. Ethene
D. Propane - The formula of ammonia is:
A. NH₄
B. NH₃
C. NO₂
D. N₂O - Which acid is found in vinegar?
A. Sulfuric acid
B. Acetic acid
C. Hydrochloric acid
D. Nitric acid - The process of decomposition by electricity is called:
A. Electrolysis
B. Hydrolysis
C. Distillation
D. Crystallization - Which of the following is a reducing agent?
A. Oxygen
B. Hydrogen
C. Chlorine
D. Fluorine - The chemical formula of baking soda is:
A. Na₂CO₃
B. NaHCO₃
C. CaCO₃
D. NaOH - Which of the following is an alkaline earth metal?
A. Sodium
B. Potassium
C. Calcium
D. Aluminum - The percentage of oxygen in air is approximately:
A. 21%
B. 78%
C. 50%
D. 10% - Which gas turns lime water milky?
A. Oxygen
B. Hydrogen
C. Carbon dioxide
D. Nitrogen - The study of carbon compounds is called:
A. Physical chemistry
B. Organic chemistry
C. Analytical chemistry
D. Inorganic chemistry - Which of the following is used to test the presence of starch?
A. Benedict’s solution
B. Iodine solution
C. Lime water
D. Litmus paper - The functional group of alcohols is:
A. –COOH
B. –OH
C. –CHO
D. –NH₂ - Which element has atomic number 11?
A. Magnesium
B. Sodium
C. Aluminum
D. Potassium - Which of the following is a non-metal?
A. Copper
B. Iron
C. Sulfur
D. Zinc - The formula of calcium carbonate is:
A. CaO
B. Ca(OH)₂
C. CaCO₃
D. CaCl₂ - Which process separates components based on boiling points?
A. Filtration
B. Distillation
C. Sedimentation
D. Sublimation - The smallest particle of an element retaining its properties is:
A. Molecule
B. Atom
C. Ion
D. Compound - Which gas is essential for respiration?
A. Nitrogen
B. Carbon dioxide
C. Oxygen
D. Hydrogen - Which of the following is an example of a physical change?
A. Rusting
B. Burning
C. Melting
D. Digestion - The formula of nitric acid is:
A. HNO₃
B. H₂SO₄
C. HCl
D. CH₃COOH - Which scientist proposed the periodic table?
A. Rutherford
B. Dalton
C. Mendeleev
D. Bohr - Which of the following is a diatomic molecule?
A. Helium
B. Neon
C. Oxygen
D. Argon - The charge on an electron is:
A. Positive
B. Neutral
C. Negative
D. Double positive - Which of the following is a base?
A. HCl
B. H₂SO₄
C. NaOH
D. CO₂ - The gas used in balloons is:
A. Oxygen
B. Nitrogen
C. Helium
D. Chlorine - The formula of methane is:
A. CH₄
B. C₂H₆
C. C₃H₈
D. C₂H₄ - Which of the following is a chemical change?
A. Freezing water
B. Boiling water
C. Burning paper
D. Dissolving sugar - Which metal is extracted from bauxite?
A. Iron
B. Copper
C. Aluminum
D. Zinc - The process of removing impurities from water is called:
A. Filtration
B. Purification
C. Distillation
D. Sedimentation - Which of the following is used as fuel in rockets?
A. Hydrogen
B. Nitrogen
C. Oxygen
D. Chlorine - Which compound is commonly known as table salt?
A. Sodium carbonate
B. Sodium chloride
C. Potassium chloride
D. Calcium carbonate - Which acid is used in car batteries?
A. Hydrochloric acid
B. Nitric acid
C. Sulfuric acid
D. Acetic acid - The chemical symbol of potassium is:
A. Po
B. Pt
C. P
D. K - Which gas is produced during photosynthesis?
A. Carbon dioxide
B. Nitrogen
C. Oxygen
D. Hydrogen - The formula of ethanol is:
A. CH₃OH
B. C₂H₅OH
C. CH₄
D. C₃H₇OH - Which element is essential for making stainless steel?
A. Sodium
B. Chromium
C. Calcium
D. Sulfur - The process by which plants lose water vapor is:
A. Respiration
B. Photosynthesis
C. Transpiration
D. Digestion - Which of the following is an example of a saturated hydrocarbon?
A. Ethene
B. Ethyne
C. Benzene
D. Ethane - Which substance is used to neutralize acidic soil?
A. HCl
B. NaOH
C. Lime
D. Vinegar - Which gas is responsible for acid rain?
A. Oxygen
B. Sulfur dioxide
C. Hydrogen
D. Helium - Which type of reaction releases energy?
A. Endothermic
B. Exothermic
C. Reversible
D. Neutralization - The formula of quick lime is:
A. CaCO₃
B. CaO
C. Ca(OH)₂
D. CaCl₂ - Which of the following is a transition metal?
A. Sodium
B. Magnesium
C. Iron
D. Calcium - Which gas is used in welding?
A. Carbon dioxide
B. Oxygen
C. Acetylene
D. Nitrogen - The atomic number of carbon is:
A. 4
B. 6
C. 8
D. 12 - Which element is used in thermometers?
A. Iron
B. Mercury
C. Copper
D. Sodium - The formula of slaked lime is:
A. CaO
B. Ca(OH)₂
C. CaCO₃
D. NaOH - Which process converts liquid into gas?
A. Freezing
B. Condensation
C. Evaporation
D. Sublimation - Which of the following is a halogen?
A. Neon
B. Chlorine
C. Argon
D. Sodium - The major component of natural gas is:
A. Ethane
B. Propane
C. Methane
D. Butane - Which of the following is an amphoteric oxide?
A. Na₂O
B. MgO
C. Al₂O₃
D. CO₂ - The pH of human blood is approximately:
A. 2.0
B. 5.5
C. 7.4
D. 10.0 - Which gas is used in photosynthesis?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Hydrogen - Which instrument is used to measure pH?
A. Thermometer
B. Barometer
C. pH meter
D. Ammeter - Which of the following is an ore of iron?
A. Bauxite
B. Hematite
C. Galena
D. Zinc blende - Which of the following is a covalent compound?
A. NaCl
B. MgO
C. H₂O
D. KCl - Which gas is commonly known as marsh gas?
A. Ethane
B. Propane
C. Methane
D. Butane - The formula of bleaching powder is:
A. CaOCl₂
B. NaCl
C. HCl
D. CaCO₃ - Which process is used to obtain pure crystals from a solution?
A. Filtration
B. Crystallization
C. Sublimation
D. Distillation - Which branch of chemistry deals with the speed of chemical reactions?
A. Organic chemistry
B. Physical chemistry
C. Biochemistry
D. Chemical kinetics