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  Chemistry  Chemistry GK – Questions & Answer  Chemistry is the science that studies matter, elements, compounds, and chemical reactions. These basic Chemistry GK questions help improve scientific knowledge and are useful for students, quizzes, and competitive exams. 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 hard...