12th Chemistry Important 1 Marks P – block elements II
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TN 12th Chemistry Important 1 Marks P – block elements II. 12th Chemistry Important Questions Chapter 3. +2 Chemistry Important 2 Marks, 3 Marks, 5 Marks Questions Based on reduced Syllabus 2021-2022. 12th Free Online Test (MCQs). HSC 12th Chemistry Revision Test Important Questions. 12th Tamil Full Guide.
12th Chemistry Important 1 Marks P – block elements II
P – Block elements –II
- 1. Chlorine is manufactured by Deacon’s process.
- 2. The process used for the manufacture of nitric acid is known as Ostwald’s process.
- 3. Hydrolysis of Urea gives Ammonia.
- 4. The halogen which exist as a liquid is Bromine
- 5. Thermodynamically stable allotrope form of sulphur is Rhombic sulphur
- 6. Red phosphCorous is used in match boxes.
- 7.The bond angle of ammonia is 1070
- 8. With excess of Chlorine, ammonia reacts to give an explosive substance NCl3
- 9. The correct order of acid strength HF < Hcl < HBr < HI
- 10. The shape of ammonia molecule is Pyramidal
- 11. F3– ion is not formed.
- 12. SO2 is used in disinfecting crops & plants in agriculture.
- 13. Least volatile hydrogen halide is HF
- 14. Neon is used in advertisements boards.
- 15. F2 > Cl2 > Br2 > I2 bond dissociation energy is not in accordance with the property stated against it?
- 16. NaNO2 is used in gun powder for fire arms.
- 17. S – S bond present in H2S2O6
- 18. S8 – Rhombic sulphur shows paramagnetic behavior.
- 19. The hybridization and shape of SF6 is sp3D2octahedral
- 20. Orthophosphoric acid is dibasic.
- 21. Catenation property of group 15 elements follows this order P >> N > As>Sb >Bi
- 22. The substance used in cryosurgery for producing low temperature is Liquid nitrogen
- 23. Chile salt Petre is NaNO3
- 24. The highest reactivity of fluorine is due to low bond dissociation energy
- 25. Helium is used in balloons in the place of hydrogen because it is incombustible, Lighter than hydrogen
- 26. The ionization energy of Gallium is higher than that of Aluminum because of More effective nuclear charge of Ga , Smaller atomic size of Ga.
- 27. KBr + I2 → 2KI + Br2. this reaction is not feasible.
- 28. Oxidation state of P in H4P2O5, H4P2O6, and H4P2O7 are respectively is +3,+4, +5.
- 29. Ammonium sulphates fertilizers would increase the activity of the soil.
- 30. Strong reducing behavior of H3PO2 is due to Presence of one –OH groups and two P-H bonds.
- 31. Maximum covalent character shown by NCl3
- 32. The first ionization energy of noble gases in the order He > Ne > Ar > Kr.
- 33. The incorrect statement is Phosphorous & Arsenic can form P𝝅-d𝝅 bond but not in nitrogen.
- 34. Nitration takes place due to the formation of nitronium ion.
- 35. Krypton light used in airports as approaching lights as they can penetrate dense fog.
- 36. P4 + 3NaOH + 3H2O → 3NaH2PO2 + PH3
- 37.2XeOF4 + SiO2 → 2XeO2F2 + SiF4
- 38. Ca(OH)2 + Cl2 → CaOCl2 (Bleaching Powder) + H2O
- 39. XeOF4 hybridization is sp3d2
- 40. NeF2 compounds is not formed.
- 41. Most easily liquefiable gas is Helium
- 42. sp3d type of hybridization in the inter halogen compound of AX3 Type.
- 43. Least electronegative element is true regarding Nitrogen.
- 44. Nitrogen, the principle gas of atmosphere is separated industrially from liquid air by fractional distillation.
- 45. Nitric acid can act as an acid, an oxidizing agent & an nitrating agent.
- 46. Calcium carbide & Calcium phosphide liberates Phosphine & acetylene when thrown into the sea.
- 47. XeF6 on complete hydrolysis produces XeO3
- 48. The basicity of Pyro phosphoric acid ( H4P2O5) is 2
- 49. P4O6 react with cold water to give H3PO3
- 50. An element belong to group 15 & 3rd period pf the periodic table its electronic configuration would be 1s22S22P63s23p3.
- 51. The compound used in smokescreen PH3 (Phosphine)
- 52. The oxidizing power of Oxo acids follows the order HOX > HXO2 > HXO3 > HXO4
- 53. The acid having O – O bond in structure H2S2O6
- 54. Fluorine is the strongest oxidizing agent.
- 55. When copper heated with concentrated HNO3 is produces Cu(NO3)2 & NO2
