The Secrets of Chemistry: Unlocking the Hidden Force of Nature

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Question 1: Which of the following is the smallest particle of an element?

A) Atom

B) Molecule

C) Ion

D) Electron

Question 2:Which of the following is a chemical change?

A) Melting of ice

B) Boiling of water

C) Burning of wood

D) Dissolving sugar in water

Question 3:Which of the following is an example of an endothermic reaction?

A) Combustion of Fuel

B) Freezing of water

C) Dissolving ammonium chloride in water

D) Burning of magnesium

Question 4: What is the atomic number of oxygen?

A) 6

B) 8

C) 16

D) 18

Question 5: What is the chemical formula of sodium bicarbonate?

A) NaCl

B) NaOH

C) NaHCO3

D) Na2CO3

Question 6: Which of the following is a noble gas?

A) Nitrogen

B) Oxygen

C) Helium

D) Chlorine

Question 7:Which of the following element is most likely to form a covalent bond with chlorine?

A) Sodium

B) Magnesium

C) Oxygen

D) Iron

Question 8: What is the pH of a neutral solution?

A) 0

B)7

C) 14

D) 3

Question 9: Which of the following metals is the best conductor of electricity?

A) Copper

B) Zinc

C) Iron

D) Aluminium

Question 10: The element with atomic number 11 is:

A) Sodium

B) Magnesium

C) Potassium

D) Calcium

Question 11: Which of the following is an example of a physical change?

A) Rusting of iron

B) Combustion of coal

C) Dissolving salt in water

D) Cooking of food

Question 12: What is the main constituent of natural gas?

A) Methane

B) Ethylene

C) Propane

D) Butane

Question 13: Which of the following is the correct formula for sulfuric acid?

A) H2SO3

B) H2SO4

C) H2S

D) SO2

Question 14: Which of the following is a property of acids?

A) They taste bitter

B) They turn blue litmus paper red

C) They are slippery

D) They feel soapy

Question 15: What is the name of the process in which a solid gas?

A) Sublimation

B) Condensation

C) Evaporation

D) Freezing

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