This set contains 50 MCQs on writing chemical formulas, the crossover method, rules for naming compounds, and the use of brackets for polyatomic ions. The questions cover binary compounds, compounds with polyatomic ions, and the systematic approach to writing formulas. These are crucial for mastering chemical nomenclature and formula writing.
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📘 SCIENCE
CHEMISTRY | Atoms & Molecules-D
📝 Questions: 50
⏱️ Timer: 20 min
Q1. Some elements show more than one valency, which is indicated by:
Q2. Roman numerals indicating valency are written in:
Q3. While writing a chemical formula, the charges on ions must:
Q4. In a compound of a metal and a non-metal, the symbol written first is of the:
Q5. In calcium oxide (CaO), oxygen is written on the right because it is a:
Q6. Which of the following is written correctly?
Q7. In compounds containing polyatomic ions, the number of ions is shown by:
Q8. Brackets are not required in a formula when the number of polyatomic ions is:
Q9. Mg(OH)₂ contains how many hydroxide ions?
Q10. NaOH does not require brackets because:
Q11. Compounds made of two different elements are called:
Q12. Hydrogen chloride has the chemical formula:
Q13. The chemical formula of hydrogen sulphide is:
Q14. Carbon tetrachloride contains how many chlorine atoms?
Q15. The chemical formula of carbon tetrachloride is:
Q16. In magnesium chloride, the cation is:
Q17. The anion in magnesium chloride is:
Q18. The chemical formula of magnesium chloride is:
Q19. In magnesium chloride, the ratio of Mg²⁺ to Cl⁻ ions is:
Q20. While writing a chemical formula, the overall charge of the compound must be:
Q21. The charges on ions are shown in the formula:
Q22. The formula of aluminium oxide is:
Q23. The valency of aluminium is:
Q24. The valency of oxygen is:
Q25. The initial unsimplified formula of calcium oxide could be:
Q26. The simplified formula of calcium oxide is:
Q27. The chemical formula of sodium nitrate is:
Q28. Calcium hydroxide is represented as:
Q29. Brackets are used in Ca(OH)₂ because:
Q30. The subscript 2 in Ca(OH)₂ indicates:
Q31. Sodium carbonate has the formula:
Q32. Brackets are not used in sodium carbonate because:
Q33. The formula of ammonium sulphate is:
Q34. Ammonium sulphate contains how many ammonium ions?
Q35. Sodium oxide has the chemical formula:
Q36. Aluminium chloride has the formula:
Q37. Sodium sulphide is represented by:
Q38. Magnesium hydroxide has the formula:
Q39. Al₂(SO₄)₃ is named as:
Q40. CaCl₂ is called:
Q41. K₂SO₄ is the formula of:
Q42. KNO₃ represents:
Q43. CaCO₃ is the chemical formula of:
Q44. The crossover method is used to:
Q45. Valency helps in determining the:
Q46. A compound having metal and non-metal is generally:
Q47. Charges on ions are written while:
Q48. Which compound contains a polyatomic ion?
Q49. The valency of sulphate ion SO₄ is:
Q50. The formula Na₂O shows that sodium has a valency of:
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