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  Chemistry  Practice questions 1-25 1. Who is known as the Father of Modern Chemistry? – Antoine Lavoisier 2. What is the lightest element in the periodic table? – Hydrogen 3. What is the chemical symbol of gold? – Au 4. Which gas is essential for respiration? – Oxygen 5. The atomic number of carbon is? – 6 6. Which acid is found in lemon? – Citric Acid 7. What is the common name of sodium chloride? – Common Salt 8. What is the pH value of pure water? – 7 (Neutral) 9. Which gas is known as laughing gas? – Nitrous Oxide (N₂O) 10. What is the chemical symbol of iron? – Fe 11. Which metal is liquid at room temperature? – Mercury 12. Which element is necessary for the formation of hemoglobin? – Iron 13. What is the hardest natural substance on Earth? – Diamond 14. Which gas is used in fire extinguishers? – Carbon Dioxide (CO₂) 15. What is the chemical symbol for lead? – Pb 16. Who proposed the atomic theory? – John Dalton 17. Which element has the highest electronegativity? – Flu...