Quiz for Elements and Compounds

Q1: What is the chemical symbol for sodium?

A. Na B. So C. Sn D. S

Q2: Which element is most abundant in the Earth's crust?

A. Iron B. Oxygen C. Silicon D. Aluminium

Q3: Water is a compound because:

A. It has a fixed boiling point B. It is made up of hydrogen and oxygen C. It is a liquid D. It can be broken into gases

Q4: Which of the following is a noble gas?

A. Nitrogen B. Oxygen C. Argon D. Carbon dioxide

Q5: Which of the following is an element?

A. Steel B. Air C. Copper D. Salt

Q6: Which compound is commonly known as table salt?

A. NaCl B. KCl C. CaCO₃ D. Na₂CO₃

Q7: Which of the following is not a compound?

A. Water B. Carbon dioxide C. Hydrogen D. Ammonia

Q8: Which element is used in thermometers?

A. Iron B. Mercury C. Lead D. Zinc

Q9: Which of the following is a compound?

A. O₂ B. N₂ C. H₂O D. He

Q10: Which of these metals is liquid at room temperature?

A. Gold B. Mercury C. Iron D. Zinc

Q11: What is the formula of carbon dioxide?

A. CO B. C₂O C. CO₂ D. C₂O₂

Q12: Rust is chemically known as:

A. FeO B. Fe₂O₃ C. FeCl₃ D. FeS

Q13: Which of the following elements is a halogen?

A. Oxygen B. Chlorine C. Nitrogen D. Sodium

Q14: What is the atomic number of carbon?

A. 6 B. 12 C. 8 D. 14

Q15: Which of the following is a compound?

A. Oxygen B. Iron C. Salt D. Nitrogen

Q16: Which gas is essential for respiration?

A. Carbon dioxide B. Oxygen C. Hydrogen D. Nitrogen

Q17: Which element is present in all acids?

A. Oxygen B. Chlorine C. Nitrogen D. Hydrogen

Q18: What is HCl commonly known as?

A. Vinegar B. Hydrogen chloride C. Hydrochloric acid D. Sulphuric acid

Q19: Which of the following is a non-metal?

A. Aluminium B. Copper C. Sulphur D. Iron

Q20: Which of the following is an alloy?

A. Brass B. Gold C. Iron D. Aluminium