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* 44. Which element is radioactive? * Answer: (C) $\text{U}$ * 45. All actinoids are * Answer: (B) Radioactive * 46. Which lanthanoid is used in lighter flints? * Answer: (B) $\text{Ce}$ * 47. Mischmetal mainly contains * Answer: (B) Lanthanoids and $\text{Ce}$ * 48. Which element is used in permanent magnets ($\text{NdFeB}$)? * Answer: (B) $\text{Nd}$ * 49. The colour of $\text{KMnO}_4$ is * Answer: (C) Purple * 50. Which compound is orange in colour? * Answer: (B) $\text{K}_2\text{Cr}_2\text{O}_7$ Would you like me to continue and solve questions 51 to 80, or do you need help with any of the Short/Long Answer questions in Section-B?

Here are the step-by-step solutions for questions 1 to 50 from the Class-XII Chemistry Examination paper: ## Section-A: Objective Type Questions * 1. Which of the following is a coordination compound? * Answer: (C) $\text{[Fe(CN)}_6\text{]}^{4-}$ * 2. The central metal atom in $\text{[Co(NH}_3\text{)}_6\text{]Cl}_3$ is * Answer: (C) Co * 3. $\text{NH}_3$ acts as * Answer: (B) Ligand * 4. $\text{CN}^-$ is an example of * Answer: (D) Ambidentate ligand * 5. The coordination number of $\text{Co}$ in $\text{[Co(NH}_3\text{)}_6\text{]}^{3+}$ is * Answer: (C) 6 * 6. The oxidation state of $\text{Fe}$ in $\text{[Fe(CN)}_6\text{]}^{4-}$ is * Answer: (B) +2 * 7. Which ligand is ambidentate? * Answer: (C) $\text{NO}_2^-$ * 8. Which of the following is a chelating ligand? * Answer: (C) $\text{EDTA}^{4-}$ * 9. The IUPAC name of $\text{[Cu(NH}_3\text{)}_4\text{]SO}_4$ is * Answer: (B) Tetra-amminecopper (II) sulphate * 10. Which of the following shows geometrical isomerism? * Answer: (B) $\text{[Pt(NH}_3\text{)}_2\text{Cl}_2\text{]}$ * 11. Cisplatin is used in * Answer: (B) Cancer treatment * 12. Which of the following is a strong field ligand? * Answer: (D) $\text{CN}^-$ * 13. Which ligand causes maximum crystal field splitting? * Answer: (C) $\text{CN}^-$ * 14. High spin complexes are generally formed by * Answer: (B) Weak field ligands * 15. Which of the following is an inner orbital complex? * Answer: (B) $\text{[Fe(CN)}_6\text{]}^{4-}$ * 16. The colour of coordination compounds is mainly due to * Answer: (C) d-d electronic transitions * 17. Which complex is diamagnetic? * Answer: (C) $\text{[Fe(CN)}_6\text{]}^{4-}$ * 18. The coordination number of $\text{EDTA}$ in metal complexes is * Answer: (D) 6 * 19. Which metal ion has $d^{10}$ configuration? * Answer: (C) $\text{Zn}^{2+}$ * 20. Which complex has coordination number 4? * Answer: (B) $\text{[Ni(CO)}_4\text{]}$ * 21. The general electronic configuration of d-block elements is * Answer: (B) $\text{(n-1)d}^{1-10} \text{ns}^{1-2}$ * 22. Which series is called the first transition series? * Answer: (B) $\text{Sc}$ to $\text{Zn}$ * 23. Transition elements are characterized by * Answer: (B) Partially filled d-orbitals * 24. Which element is not a transition element? * Answer: (C) $\text{Zn}$ * 25. Which transition metal shows the highest number of oxidation states? * Answer: (C) $\text{Mn}$ * 26. The oxidation state of $\text{Mn}$ in $\text{KMnO}_4$ is * Answer: (D) +7 * 27. The colour of transition metal ions is mainly due to * Answer: (B) d-d electronic transition * 28. Transition metals are generally * Answer: (B) Hard and dense * 29. Which transition metal is used in stainless steel? * Answer: (B) $\text{Cr}$ * 30. Which metal is used in galvanization? * Answer: (C) $\text{Zn}$ * 31. The magnetic property of transition elements is due to * Answer: (B) Unpaired electrons * 32. Which ion is colourless? * Answer: (C) $\text{Sc}^{3+}$ * 33. Which transition element is used as a catalyst in the Haber process? * Answer: (B) $\text{Fe}$ * 34. Which catalyst is used in the contact process? * Answer: (B) $\text{V}_2\text{O}_5$ * 35. Which metal is used in hydrogenation of oils? * Answer: (B) $\text{Ni}$ * 36. Lanthanoids belong to which block? * Answer: (D) f-block * 37. Actinoids belong to which block? * Answer: (A) f-block * 38. Which is the first Lanthanoid? * Answer: (A) $\text{Ce}$ (Cerium) * 39. Which is the first actinoid? * Answer: (A) $\text{Th}$ (Thorium) * 40. The common oxidation state of lanthanoids is * Answer: (B) +3 * 41. Which lanthanoid shows +4 oxidation state? * Answer: (B) $\text{Ce}$ * 42. The gradual decrease in the size of lanthanoids is called * Answer: (B) Lanthanoid contraction * 43. Lanthanoid contraction is due to * Answer: (B) Poor shielding effect by 4f electrons

* 44. Which element is radioactive? * Answer: (C) $\text{U}$ * 45. All actinoids are * Answer: (B) Radioactive * 46. Which lanthanoid is used in lighter flints? * Answer: (B) $\text{Ce}$ * 47. Mischmetal mainly contains * Answer: (B) Lanthanoids and $\text{Ce}$ * 48. Which element is used in permanent magnets ($\text{NdFeB}$)? * Answer: (B) $\text{Nd}$ * 49. The colour of $\text{KMnO}_4$ is * Answer: (C) Purple * 50. Which compound is orange in colour? * Answer: (B) $\text{K}_2\text{Cr}_2\text{O}_7$ Would you like me to continue and solve questions 51 to 80, or do you need help with any of the Short/Long Answer questions in Section-B?

Here are the step-by-step solutions for questions 1 to 50 from the Class-XII Chemistry Examination paper: ## Section-A: Objective Type Questions * 1. Which of the following is a coordination compound? * Answer: (C) $\text{[Fe(CN)}_6\text{]}^{4-}$ * 2. The central metal atom in $\text{[Co(NH}_3\text{)}_6\text{]Cl}_3$ is * Answer: (C) Co * 3. $\text{NH}_3$ acts as * Answer: (B) Ligand * 4. $\text{CN}^-$ is an example of * Answer: (D) Ambidentate ligand * 5. The coordination number of $\text{Co}$ in $\text{[Co(NH}_3\text{)}_6\text{]}^{3+}$ is * Answer: (C) 6 * 6. The oxidation state of $\text{Fe}$ in $\text{[Fe(CN)}_6\text{]}^{4-}$ is * Answer: (B) +2 * 7. Which ligand is ambidentate? * Answer: (C) $\text{NO}_2^-$ * 8. Which of the following is a chelating ligand? * Answer: (C) $\text{EDTA}^{4-}$ * 9. The IUPAC name of $\text{[Cu(NH}_3\text{)}_4\text{]SO}_4$ is * Answer: (B) Tetra-amminecopper (II) sulphate * 10. Which of the following shows geometrical isomerism? * Answer: (B) $\text{[Pt(NH}_3\text{)}_2\text{Cl}_2\text{]}$ * 11. Cisplatin is used in * Answer: (B) Cancer treatment * 12. Which of the following is a strong field ligand? * Answer: (D) $\text{CN}^-$ * 13. Which ligand causes maximum crystal field splitting? * Answer: (C) $\text{CN}^-$ * 14. High spin complexes are generally formed by * Answer: (B) Weak field ligands * 15. Which of the following is an inner orbital complex? * Answer: (B) $\text{[Fe(CN)}_6\text{]}^{4-}$ * 16. The colour of coordination compounds is mainly due to * Answer: (C) d-d electronic transitions * 17. Which complex is diamagnetic? * Answer: (C) $\text{[Fe(CN)}_6\text{]}^{4-}$ * 18. The coordination number of $\text{EDTA}$ in metal complexes is * Answer: (D) 6 * 19. Which metal ion has $d^{10}$ configuration? * Answer: (C) $\text{Zn}^{2+}$ * 20. Which complex has coordination number 4? * Answer: (B) $\text{[Ni(CO)}_4\text{]}$ * 21. The general electronic configuration of d-block elements is * Answer: (B) $\text{(n-1)d}^{1-10} \text{ns}^{1-2}$ * 22. Which series is called the first transition series? * Answer: (B) $\text{Sc}$ to $\text{Zn}$ * 23. Transition elements are characterized by * Answer: (B) Partially filled d-orbitals * 24. Which element is not a transition element? * Answer: (C) $\text{Zn}$ * 25. Which transition metal shows the highest number of oxidation states? * Answer: (C) $\text{Mn}$ * 26. The oxidation state of $\text{Mn}$ in $\text{KMnO}_4$ is * Answer: (D) +7 * 27. The colour of transition metal ions is mainly due to * Answer: (B) d-d electronic transition * 28. Transition metals are generally * Answer: (B) Hard and dense * 29. Which transition metal is used in stainless steel? * Answer: (B) $\text{Cr}$ * 30. Which metal is used in galvanization? * Answer: (C) $\text{Zn}$ * 31. The magnetic property of transition elements is due to * Answer: (B) Unpaired electrons * 32. Which ion is colourless? * Answer: (C) $\text{Sc}^{3+}$ * 33. Which transition element is used as a catalyst in the Haber process? * Answer: (B) $\text{Fe}$ * 34. Which catalyst is used in the contact process? * Answer: (B) $\text{V}_2\text{O}_5$ * 35. Which metal is used in hydrogenation of oils? * Answer: (B) $\text{Ni}$ * 36. Lanthanoids belong to which block? * Answer: (D) f-block * 37. Actinoids belong to which block? * Answer: (A) f-block * 38. Which is the first Lanthanoid? * Answer: (A) $\text{Ce}$ (Cerium) * 39. Which is the first actinoid? * Answer: (A) $\text{Th}$ (Thorium) * 40. The common oxidation state of lanthanoids is * Answer: (B) +3 * 41. Which lanthanoid shows +4 oxidation state? * Answer: (B) $\text{Ce}$ * 42. The gradual decrease in the size of lanthanoids is called * Answer: (B) Lanthanoid contraction * 43. Lanthanoid contraction is due to * Answer: (B) Poor shielding effect by 4f electrons

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