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    GRP 13 P Block CHEMHACK - 46cdc4ca 9e6e 49b6 Bd47 8f6b1558be0a

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    GRP 13 P Block CHEMHACK - 46cdc4ca 9e6e 49b6 Bd47 8f6b1558be0a

    Uploaded by

    Atulya Khatter
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    Grp 13 P Block CHEMHACK_46cdc4ca 9e6e 49b6 Bd47 8f6b1558be0a

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    4 views5 pages

    GRP 13 P Block CHEMHACK - 46cdc4ca 9e6e 49b6 Bd47 8f6b1558be0a

    Uploaded by

    Atulya Khatter

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    of 5

    Chapter 5

    THE P-BLOCK ELEMENTS


    INTRODUCTION

    1. Occurrence of oxidation states 2 unit less than the group oxidation states is because of - (JEE)
    2. Tendency to show inert pair effect decrease/increase down the group.
    3. Group 13 elements -
    4. Group 14 elements -
    5. Group 15 elements -
    6. Group 16 elements -
    7. Group 17 elements -
    8. Group 18 elements

    5.1 GROUP 13 ELEMENTS


    9. Al is a metal/non-metal.
    10. Kernite formula - (NEET) (JEE 2021)
    11. Boron occurs as - (3)
    12. In India, borax occur in - (2)
    13. Boron isotopes are ___ and ___ and most abundant isotope is -
    14. Most abundant metal in the earth is -
    15. ___ is the 3rd most abundant element.
    16. Bauxite formula -
    17. Cryolite formula - DigaQ 1.
    18. Atomic Radius trend - D
    E
    C
    19. Ionic radius trend - B A
    20. I.E (I) trend -
    21. I.E (II) trend -
    22. I.E (III) trend -
    23. Electronegativity trend -
    24. Density trend -
    25. M.P trend -
    26. B.P trend -
    27. Boron is hard/soft and white/black.

    ANSWERS 1
    THE P-BLOCK ELEMENTS 27

    CHEMICAL PROPERTIES

    28. In Tl, +3 oxidation state is highly oxidising. T/F (NEET)


    29. The compounds in +1 oxidation state are more covalent than +3 oxidation state. T/F (JEE)
    30. The tendency to behave as Lewis acid increases down the group. T/F
    31. Aluminium chloride in acidified aqueous solution forms -
    32. Boron tri-oxides are acidic/basic.
    33. Amphoteric oxides are made by which group 13 elements ?
    34. B + O₂ + Δ →
    35. Boron does not react with acids and alkalis even at moderate temperature. T/F
    36. Conc. nitric acid with Al causes no reaction. T/F
    37. 2Al(s) + 2NaOH(aq) + 6H₂O(l) →
    38. Why white fumes appear around the bottle of anhydrous aluminium chloride ?

    IMPORTANT COMPOUNDS OF BORON


    39. Borax formula -
    40. Borax contains tetranuclear units of -
    41. Na₂B₄O₇ + 7H₂O →
    → →
    42. Na₂B₄O₇.10H₂O + Δ A B + C. Identify A, B and C.
    43. NaBO₂ is called -
    44. Co(BO₂)₂ is of ____ colour.
    45. The metaborates of many transition metals have characteristic colours. T/F (JEE 2021)
    46. ______ test use borax to identify metals.
    47. ______ has a soapy touch.
    48. Orthoboric acid is a white/black crystalline solid.
    49. Na₂B₄O₇ + 2HCl + 5H₂O →
    50. Heating orthoboric acid above _____ K forms metaboric acid.
    → →
    51. H₃BO₃ + Δ A + Δ B. Identify A & B.
    52. Boric acid is a Arrhenius acid. T/F (JEE)
    53. 4BF₃ + 3LiAlH₄ → DigaQ 2.
    54. Convenient laboratory method to prepare diborane is -
    55. On industrial scale, diborane is prepared by - A
    B
    56. The temp. at which above reaction operate is - D
    57. B₂H₆ is colourless. T/F
    C

    ANSWERS 1 ANSWERS 2
    28 CHEMHACK

    58. B₂H₆ + 3O₂ →


    →
    59. B₂H₆(g) + 6H₂O(l)
    60. B₂H₆ + 2CO →
    61. B₂H₆ + 2NMe₃ →
    62. ______ is known as inorganic benzene. (JEE)
    63. Borazine formula -
    → →
    64. 3B₂H₆ + 6NH₃ A + Δ B. Identify A & B.
    65. Diborane have 2 centre - 3 electron bonds. T/F (JEE)
    66. Borohydrides ex - (1)
    67. Borohydrides are prepared by reacting ____ and ____ in ______
    68. ______ are used in making bullet-proof vests and light composing material for aircraft.
    69. ____ have a high ability to absorb neutrons.
    70. Metal borides are used in nuclear industry as protective shields and control rods. T/F
    71. Heat resistant glasses ex -
    72. Main industrial application of borax and boric acid is in the manufacture of -
    73. Aqueous solution of of _______ is generally used as a mild antiseptic.
    74. Electrical conductivity of Al is twice/thrice that of Cu.
    75. Al has a toxic nature. T/F
    76. Al is used in packing and aeroplane and transportation industry. T/F
    77. Hybridization of boron in diborane is - (NEET)

    ANSWERS 2
    THE P-BLOCK ELEMENTS 29

    ANSWERS
    INTRODUCTION CHEMICAL PROPERTIES
    1. Inert pair effect 28. T
    2. Increase 29. F
    3. B, Al, Ga, In, Tl (Trick - BAll Gaind India Tendulkar) 30. F
    4. C, SI, Ge, Sn, Pb (Trick - CaSi Gaye Snkar Pabati) 31. [Al(H₂O)₆]³⁺
    5. N, P, As, Sb, Bi (Trick -Nana Patekar Aishwarya Sb 32. Acidic
    Bimar)
    33. Al and Ga
    6. O, Se, Te, Po (Trick - Os Se Tee Po)
    34. B₂O₃
    7. F, Cl, Br, I, At (Trick - Fir Cal Bhar I Aunty)
    35. T
    8. He, Ne, Ar, Kr, Xe, Rn (Trick - Hena Nena Aur
    Karena Xete Rahna) 36. T
    37. 2 Na⁺[Al(OH)₄]⁻ (aq) + 3H₂(g)
    GROUP 13 ELEMENTS 38. Because it partially hydrolyse with atmospheric
    9. Metal moisture to to liberate HCl
    10. Na₂B₄O₇·4H₂O IMPORTANT COMPOUNDS OF
    11. Orthoboric acid, borax and kernite BORON
    12. Puga Valley (Ladakh) and Sambhar Lake 39. Na₂B₄O₇⋅10H₂O
    (Rajasthan) 40. [B₄O₅(OH)₄]²⁻
    13. 10B and 11B, 11B 41. 2NaOH + 4H₃BO₃
    14. Al 42. A = Na₂B₄O₇, B = NaBO₂ + B₂O₃]
    15. Al 43. Sodium metaborate
    16. Al₂O₃.2H₂O 44. Blue
    17. Na₃AlF₆ 45. T
    18. B < Ga < Al < In < Tl 46. Borax bead
    19. B < Al < Ga < In < Tl 47. Orthoboric acid
    20. B > Tl > Ga > Al > In 48. White
    21. B > Ga > Tl > In > Al 49. 2NaCl + 4B(OH)₃
    22. B > Ga > Tl > Al > In 50. 370 K
    23. B > Tl > In > Ga > Al 51. HBO₂, B₂O₃
    24. B < Al < Ga < In < Tl 52. F, Lewis acid
    53. 2B₂H₆ + 3LiF + 3AlF₃
    25. B > Al > Tl > In > Ga
    26. B > Al > Ga > In > Tl →
    54. 2NaBH₄ + I₂ B₂H₆ + 2NaI + H₂
    27. Hard, black

    QUESTIONS 1 QUESTIONS 2
    30 CHEMHACK

    →
    55. 2BF + 6NaH B₂H₆ + 6NaF DigaQs
    56. 450 K DigaQ 1. - Stucture of Aluminium Chloride (AlCl₃)
    57. T A - 118°
    58. B₂O₃ + 3H₂O B - 79°
    59. 2B(OH)₃(aq) + 6H₂(g) C - 101°
    60. 2BH₃⋅CO D - 206 pm
    61. 2BH₃⋅NMe₃ E - 221 pm
    62. Borazine DigaQ 2. - Structure of Diborane (B₂H₆)
    63. B₃N₃H₆ A - 97°
    64. A - B₂H₆.2NH₃ [BH₂(NH₃)₂]⁺[BH₄]⁻ B - 120°
    B - B₃N₃H₆ C - 134 pm
    65. F D - 119 pm
    66. NaBH₄
    67. Metal hydrides with diborane in presence of
    diethyl ether
    68. Boron fibers
    69. Boron - 10
    70. T
    71. Pyrex
    72. Heat resistant glass
    73. Orthoboric acid
    74. Twice
    75. T
    76. T
    77. sp³

    QUESTIONS 2 QUESTIONS 3

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