TOTAL NUMBER OF QUESTIONS:30
Q1. In a balanced chemical equation, the number of atoms of each element is:
Q2. Which law is followed while balancing chemical equations?
Q3. Which of the following is NOT a chemical reaction?
Q4. What do coefficients in a chemical equation show?
Q5. In the reaction Mg + O₂ → MgO, MgO is a:
Q6. Which of the following shows a chemical reaction?
Q7. Which of the following is a balanced equation?
Q8. In Zn + HCl → ZnCl₂ + H₂, hydrogen is:
Q9. The law of conservation of mass states that mass is:
Q10. The substances formed after a chemical reaction are called:
Q11. Which part of a chemical equation shows reactants?
Q12. The formula of water is:
Q13. What is the physical state of a substance shown by (s)?
Q14. Which symbol is used to show heat in a chemical equation?
Q15. Which one is needed to make an equation balanced?
Q16. In a chemical equation, the substances that react are called:
Q17. A chemical reaction always involves:
Q18. A balanced chemical equation has:
Q19. In Fe + S → FeS, Fe and S combine to form:
Q20. The arrow (→) in a chemical equation is read as:
Q21. A chemical reaction involves:
Q22. Which one is a chemical change?
Q23. The state symbol (l) stands for:
Q24. In a chemical equation, coefficients are placed:
Q25. Which of the following is a product?
Q26. The symbol (aq) in a chemical equation means:
Q27. Which part of a chemical equation shows products?
Q28. Which of the following is always true for a balanced equation?
Q29. Which of the following reactions forms a new substance?
Q30. Which state is represented by (g)?