Introduction
This set includes 50 MCQs covering atomic mass units, relative atomic mass, modern atomic mass standards, and the concept of molecules and ions. The questions emphasize the shift from earlier standards to carbon-12, valency concepts, and the formation of molecules and ions. These are essential topics for understanding chemical formulas and reactions.
⏳ Time Left: 20:00
Progress: 0%
📘 SCIENCE
CHEMISTRY | Atoms & Molecules-C
📝 Questions: 50
⏱️ Timer: 20 min
Q1. For universal acceptance, the atomic mass unit was defined in the year:
Q2. The standard reference for atomic mass is the isotope of:
Q3. One atomic mass unit (1 u) is equal to:
Q4. Earlier, scientists used which element to define atomic mass unit?
Q5. Oxygen was chosen earlier because it:
Q6. Another reason oxygen was chosen was because it gave atomic masses mostly:
Q7. Relative atomic mass is measured with respect to:
Q8. Relative atomic mass is defined as the average mass of an atom compared to:
Q9. The atomic mass of hydrogen is:
Q10. The atomic mass of carbon is:
Q11. The atomic mass of nitrogen is:
Q12. The atomic mass of oxygen is:
Q13. The atomic mass of sodium is:
Q14. The atomic mass of magnesium is:
Q15. The atomic mass of sulphur is:
Q16. The atomic mass of chlorine is:
Q17. The atomic mass of calcium is:
Q18. Atoms of most elements cannot exist independently and form:
Q19. Matter that we can see or touch is formed by aggregation of:
Q20. A molecule is a group of atoms that are:
Q21. A molecule is the smallest particle that can:
Q22. Molecules show all the properties of the:
Q23. Atoms of the same element can form:
Q24. Atoms of different elements form:
Q25. A group of atoms carrying a charge is called:
Q26. A charged group of atoms is specifically known as a:
Q27. Chloride ion is represented as:
Q28. Calcium oxide is formed from calcium and:
Q29. The ratio by mass of calcium oxide is:
Q30. Magnesium sulphide is formed from magnesium and:
Q31. The ratio by mass of magnesium sulphide is:
Q32. Sodium chloride is formed from sodium and:
Q33. The ratio by mass of sodium chloride is:
Q34. The chemical formula of a compound represents its:
Q35. The combining capacity of an element is called:
Q36. Valency helps to determine how atoms:
Q37. Valency can be compared to:
Q38. Sodium ion carries a charge of:
Q39. Magnesium ion is represented as:
Q40. Aluminium ion has a valency of:
Q41. Ammonium ion is represented by the symbol:
Q42. Hydroxide ion is represented as:
Q43. Sulphate ion carries a charge of:
Q44. Phosphate ion has a charge of:
Q45. The chemical symbol for silver is:
Q46. The chemical symbol for gold is:
Q47. The valency of sodium is:
Q48. The valency of magnesium is:
Q49. The valency of aluminium is:
Q50. The valency of oxygen is:
0 Comments