Exploring the Wild World of Chemical Reactions: Surprising Facts

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Question 1: Which of the following is a physical change?

A) Burning of wood

B) Dissolving sugar in water

C) Rusting of iron

D) Cooking of food

Question 2:Which of the following is not an example of a chemical reaction?

A) Burning of paper

B) Boiling of water

C) Photosynthesis

D) Fermentation

Question 3: What is the atomic number of Oxygen?

A) 6

B) 8

C) 12

D) 16

Question 4: Which of these elements is a noble gas?

A) Nitrogen

B) Oxygen

C) Neon

D) Chlorine

Question 5: The molecular formula of methane is:

A) CH3

B) C2H4

C) CH4

D) C3H8

Question 6:Which of the following is a non-metal?

A) Iron

B) Copper

C) Sodium

D) Carbon

Question 7:Which of the following is an example of a compound?

A) Air

B Water

C) Oxygen

D) Nitrogen

Question 8: What is the pH value of pure water?

A) 0

B) 7

C) 14

D) 10

Question 9: Which of the following is the correct symbol for potassium?

A) K

B) P

C) Po

D) Pt

Question 10: Which of the following is a chemical property of acids?

A) They turn litmus paper red

B) They are slippery to touch

C) They taste bitter

D) They are good conductors of electricity

Question 11: What is the chemical formula of sulphuric acid?

A) HCl

B) H2SO4

C) HNO3

D) CH3COOH

Question 12: What is the name of the process in which a solid changes directly into a gas?

A) Melting

B) Sublimation

C) Condensation

D) Freezing

Question 13: Which of the following metals does not react with water?

A) Sodium

B) Magnesium

C) Calcium

D) Gold

Question 14: What is the name of the negatively charged particle in an atom?

A) Proton

B) Neutron

C) Electron

D) Nucleus

Question 15: Which of the following elements is a halogen?

A) Nitrogen

B) Chlorine

C) Oxygen

D) Phosphorus

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