Q1. Aluminium, iron and zinc react with:
Q2. The reactivity series arranges metals in:
Q3. The decreasing order of reactivity with dilute acids is:
Q4. Nitric acid does not produce hydrogen gas because it is a:
Q5. The most exothermic reaction with dilute HCl is shown by:
Q6. Calcium floats on water because:
Q7. Ionic compounds do not conduct electricity in solid state because:
Q8. Potassium and sodium catch fire when kept in open because they:
Q9. Oxygen is abundant in earth’s crust, so many ores are:
Q10. Sodium and potassium are not used in acid reactions because they:
Q11. Ionic compounds are generally soluble in:
Q12. Sodium is kept immersed in kerosene oil to:
Q13. Sodium reacts violently with cold water because the reaction is:
Q14. Copper does not react with dilute HCl because it is:
Q15. Iron filings burn vigorously because:
Q16. The most reactive metal observed in Activity 7.9 is:
Q17. Sodium forms Na⁺ ion by:
Q18. Which metals do not react with water at all?
Q19. On heating copper in air, the black coating formed is:
Q20. Chlorine forms Cl⁻ ion by:
Q21. Sodium chloride exists as:
Q22. A more reactive metal can:
Q23. Ionic compounds conduct electricity in molten state because:
Q24. Moderately reactive metals are usually found as:
Q25. The fastest formation of bubbles with dilute HCl occurs with:
Q26. Ionic compounds are hard and brittle due to:
Q27. Displacement reactions are best evidence of:
Q28. Iron displaces copper from:
Q29. In MgCl₂, the cation is:
Q30. Which metals produce hydrogen with very dilute nitric acid?
Q31. Magnesium, aluminium and zinc are protected from further oxidation by:
Q32. Highly reactive metals are never found:
Q33. Hydrogen is included in the reactivity series to:
Q34. The least reactive metal is:
Q35. The earth’s crust is the major source of:
Q36. Metals reacting with water generally produce:
Q37. Which metals do not react with oxygen even at high temperature?
Q38. Metals react with dilute acids to produce:
Q39. Different extraction methods are used because metals have:
Q40. Calcium reacts with water to form:
Q41. Minerals containing high percentage of metal are called:
Q42. Compounds formed by transfer of electrons are called:
Q43. Gold and platinum are found in nature in:
Q44. Noble gases are least reactive because they have:
Q45. Ionic compounds are generally:
Q46. Magnesium reacts with:
Q47. The most reactive metal in the reactivity series is:
Q48. Ionic compounds have high melting points because:
Q49. Metals at the top of the reactivity series are:
Q50. Hydrogen gas produced in sodium–water reaction: