12th Chemistry Important 1 Marks P – block elements I

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12th Chemistry Important 1 Marks P – block elements I

• 1. General empirical formula of silicone is (R₂SiO)
• 2. Potash alum is used for purification of water and styptic agent to arrest bleeding.
• 3. Inert Pair effect is observed in 13,14,15,16 groups.
• 4. Borax glass is Na₂B₄O₇
• 5. The hybridization of carbon atom in graphite is sp₂
• 6. The Borax compound used as a flux in metallurgy.
• 7. Silicone resins obtained by blending silicone with acrylic esters.
• 8. Six allotropes possible for boron.
• 9. The formula of colemanite is Ca₂B₆O₁₁
• 10. More toxic element in boron family is Thallium
• 11. The most stable form of allotropes of carbon is Graphite
• 12. The compound used in eye drops and antiseptic is Boric acid
  
• 13. Group no. 13 to 18 in the periodic table belongs to P – Block elements.
• 14. Graphite is soft and conducts electricity with hexagonal net of sp²hybridisation of carbon.
• 15. S – Block elements show only positive oxidation state.
• 16. Group no. 13 in the periodic table is called as Icosagens
• 17. Group no. 14 in the periodic table is called as Tetragens
• 18. Group no. 15 in the periodic table is called as Pnictogens
• 19. Group no. 6 in the periodic table is called as Chalcogens
• 20. Generally on descending a group the ionization energy decreases, metallic character will increases
• 21. 10 B ₅ isotope is used as moderator in nuclear reactor.
• 22. C , N, P, O, S, Se, elements are non-metals.
• 23. Ti⁺ is more stable.
• 24. Boric acid heated with soda ash it gives Borax
• 25. When Boric acid reacted with ethyl alcohol in presence of Con. Sulphuric acid it gives trialkyl borate
• 26. When heated at red hot, boric acid gives a glassy mass substance is Boric anhydride
• 27. Borax is used for the identification of coloured metal ions.
• 28. The substance which is hard and not conduct electricity with tetrahedral net of sp3 hybridization of carbon allotrope is Diamond
• 29. Boron is essential for cell wall plants.
• 30. Oxidizing acids reacts with boron it gives H3BO3 (Boric acid)
• 31. Group no.18 elements are inert because of their Stable completely filled orbital
  
• 32. Carbon nanotubes have graphite like tubes with fullerene ends and stronger than steel.
• 33. Potash alum is K₂SO₄.Al₂(SO₄)₃24H₂O.
• 34. The stability of + 1 oxidation state increase in the sequence Al < Ga < ln < Tl
• 35. Fullerene, dry ice is not sp² hybridized.
• 36. Correct statement: Alums are more soluble in cold water than in hot water.
• 37. Least electronegative element is true regarding Nitrogen.
• 38. The geometry of which carbon atom in diamond are bonded to each other is
  Tetrahedral
• 39. Metal borides is used in nuclear reactors as protective shields and control rod
• 40. Borazole is B₃N₃H₆
• 41. Boric acid is B(OH)₃ or H₃BO₃
• 42. Quartz is SIO₂
• 43. Borax is Na₂B₄O₇
• 44. Me₃SICl is not a monomer for high molecular mass silicone polymer.
• 45. The element that does not show catenation in p-block element is Lead (Pb)
  
• 46. Boric acid is an acid because its molecule accepts OH- from water, releasing proton.
  
• 47. In diborane the no. of. Electrons that accounts for banana bonds is 4
• 48. Carbon atom in fullerene with formula C60 have sp² hybridized
• 49. Aluminum metal has the largest abundance in the earth’s crust.
• 50. B₃H₆ is not a borane.
• 51. This statement is not correct: Feldspar is not aluminosilicate.
• 52. Sodium alum is [Na₂SO₄.Al₂(SO₄)₃.24H₂O]
• 53. Ammonium alum is [(NH₄)₂SO₄.Al₂(SO₄)₃.24H₂O]
• 54. Chrome alum is [ K₂SO₄.Cr₂(SO₄)₃.24H₂O]
• 55. The trialkyl borate on reaction with NaH in THF to form a Co-ordination compound which acts as powerful reducing agent
• 56. Amorphous boron is used as a Rocket fuel igniter.
• 57. The P – block elements have a general electronic configuration of ns²,np^1-6
• 58. In p-block elements electronegativity decreases as we move down the group.
• 59. In p-block elements a steady decrease in ionization enthalpy of elements due to increase in their atomic radius.
  
• 60. Boron has most common allotropes are Amorphous boron, ∝ Rhombohedra boron, 𝜷 rhombohedra boron, 𝜸 orthorhombic boron, 𝜶 tetragonal boron, 𝜷-tetragonal boron.