Chemistry Test For W.A.S.S.C.E & N.E.C.O Candidates (40 Questions) Trials

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Question 1: What is the molecular formula of methane?

a) CH3 b) C2H6 c) CH4 d) C6H12O6

Question 2: What is the chemical symbol for gold?

a) Ag b) Au c) Fe d) Cu

Question 3: How many valence electrons does an oxygen atom have?

a) 2 b) 4 c) 6 d) 8

Question 4: Which gas is essential for respiration?

a) Nitrogen b) Oxygen c) Carbon dioxide d) Helium

Question 5: Which of the following is a noble gas?

a) Hydrogen b) Helium c) Carbon d) Oxygen

Question 6: What is the molecular formula of water?

a) H2O b) CO2 c) NH3 d) CH4

Question 7: Which of the following elements is a metal?

a) Chlorine b) Oxygen c) Hydrogen d) Sodium

Question 8: What is the SI unit of temperature?

a) Kelvin b) Celsius c) Fahrenheit d) Rankine

Question 9: Which gas is responsible for the blue color of the sky?

a) Nitrogen b) Oxygen c) Carbon dioxide d) Ozone

Question 10: What is the chemical formula for methane?

a) CO2 b) NH3 c) CH4 d) H2O

Question 11: What is the chemical symbol for gold?

a) Au b) Ag c) G d) Go

Question 12: What is the molar mass of water (H2O)?

a) 18 g/mol b) 22 g/mol c) 32 g/mol d) 10 g/mol

Question 13: Which element is essential for protein synthesis and is found in all living organisms?

a) Carbon b) Oxygen c) Nitrogen d) Calcium

Question 14: What is the chemical name of baking soda?

a) Sodium sulfate b) Sodium chloride c) Sodium bicarbonate d) Sodium hydroxide

Question 15: Which gas is responsible for the greenhouse effect?

a) Nitrogen b) Oxygen c) Carbon dioxide d) Helium

Question 16: What is the chemical formula for table salt?

a) Na2SO4 b) NaCl c) HCl d) H2SO4

Question 17: Which element is the most abundant in the Earth's crust?

a) Oxygen b) Carbon c) Silicon d) Iron

Question 18: What is the process by which a solid directly changes into a gas without passing through the liquid phase?

a) Melting b) Evaporation c) Sublimation d) Condensation

Question 19: Which of the following is a primary color of light?

a) Red b) Cyan c) Yellow d) Magenta

Question 20: What is the chemical formula for glucose?

a) C6H12O6 b) CH4 c) NaCl d) H2O

Question 21: Which type of reaction involves both oxidation and reduction?

a) Single displacement b) Double displacement c) Acid-base d) Redox

Question 22: Which gas is released during respiration?

a) Oxygen b) Carbon dioxide c) Nitrogen d) Hydrogen

Question 23: What is the atomic number of carbon?

a) 6 b) 12 c) 14 d) 16

Question 24: Which process involves the breakdown of a compound into simpler substances by heat?

a) Combustion b) Oxidation c) Decomposition d) Synthesis

Question 25: What is the chemical name for rust?

a) Sodium oxide b) Iron oxide c) Calcium oxide d) Potassium oxide

Question 26: Which of the following is a halogen?

a) Sodium b) Chlorine c) Calcium d) Iron

Question 27: What is the molecular formula of ethene?

a) C2H4 b) C6H12 c) C3H6 d) C4H8

Question 28: Which type of bond involves the sharing of electrons?

a) Ionic bond b) Covalent bond c) Metallic bond d) Hydrogen bond

Question 29: What is the chemical formula for ammonia?

a) NH3 b) H2O c) CO2 d) NO3

Question 30: Which gas is commonly known as laughing gas?

a) Oxygen b) Carbon dioxide c) Nitrous oxide d) Hydrogen

Question 31: What is the process of converting a liquid into a solid by cooling called?

a) Melting b) Vaporization c) Freezing d) Sublimation

Question 32: What is the chemical formula for hydrochloric acid?

a) HCl b) H2SO4 c) NaOH d) CH3COOH

Question 33: What is the molecular formula of butane?

a) C2H4 b) C3H6 c) C4H8 d) C5H10

Question 34: Which element is a non-metal?

a) Sodium b) Silicon c) Iron d) Magnesium

Question 35: What is the chemical formula for carbon dioxide?

a) CO b) CO2 c) CH4 d) C6H12O6

Question 36: What is the process of a substance absorbing water and swelling called?

a) Hydration b) Vaporization c) Condensation d) Sublimation

Question 37: Which gas is known as "heavy hydrogen"?

a) Deuterium b) Helium c) Neon d) Tritium

Question 38: What is the process by which a liquid changes into a gas at the surface?

a) Evaporation b) Condensation c) Sublimation d) Melting

Question 39: Which gas is responsible for the greenhouse effect?

a) Oxygen b) Nitrogen c) Carbon dioxide d) Helium

Question 40: What is the process of combining two or more substances to form a new substance?

a) Decomposition b) Synthesis c) Oxidation d) Dissolution