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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
which of the following statement is not correct .A. `B(OH)_(3)` is acidicB. Potash aluma is used to stop bleeding .C. The decreasing Order of Lewis acisdic charcter of `BBR_(3)` , `BCl_(3)and B_(2)"is" BBr_(3)gt BCl_(3)gt BF_(3)`D. `B_(2)H_(6)`contains B-B covalent bonds. |
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Answer» Correct Answer - 4 |
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| 52. |
`Na_(2)B_(4)O_(7).10H_(2)Ooverset("Heat")rarrX + NaBO_(2) + H_(2)O, X + Cr_(2)O_(3) overset("Heat")rarrunderset(("Green coloured"))Y` X and Y are :A. `Na_(3)BO_(3)` & `Cr(BO_(2))_(3)`B. `Na_(2)B_(4)O_(7)` & `Cr(BO_(2))_(3)`C. `B_(2)O_(3)` & `Cr(BO_(2))_(3)`D. `B_(2)O_(3)` & `CrBO_(3)` |
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Answer» Correct Answer - C |
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| 53. |
`Na_(2)b_(4)O_(7)10H_(2)O` isA. BoraxB. KerniteC. Glauber saltD. Colemanite |
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Answer» Correct Answer - 1 |
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| 54. |
In the compound `Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O`, it the (i) number of `B-O-B` bonds is x (ii) number of `B-B` bonds is y (iii) number of `sp^(2)` hybridised B atoms is z calculate the value of `x +y + z`. |
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Answer» Correct Answer - 7 |
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| 55. |
Selec the correct statement(s) :A. Borax is made up of two triangular `BO_(3)` units and two tetrahedral `BO_(4)` unitsB. `Sn(OH)_(2), Al(OH)_(3), Pb(OH)_(2)` are all insoluble in `NaOH `C. Borazole is reactive than benzeneD. Anhydrous `AlCl_(3)` is obtained by heating a mixture of alumina and coke in a current of dry chlorine. |
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Answer» Correct Answer - A::C::D |
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| 56. |
Which of the following reactions lead to the formation of `H_(2)` ?A. `B_(2)H_(6) overset(H_(2)O)rarr`B. `Al(OH)_(3) overset(NaOH)rarr`C. `B_(2)H_(6) overset(LiH)rarrXoverset(H_(2)O)`D. `"Boron" overset(Delta)underset(NaOH)rarr` |
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Answer» Correct Answer - A::C::D |
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| 57. |
Consider the structure of `Al_(2)Me_(6)` compound and find the value of `x/y` Where, `x =` total number of atoms that are `sp^(3)` hydridised and `y =` total number of `3c2e` bonds. |
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Answer» Correct Answer - 4 |
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| 58. |
Identify the correct statement about Ortho boric acidA. It has layer structure in which planar `BO_(3)^(3-)` units are joined by hydrogen bondsB. Ortho boric acid is a weak monobasic Lewis acidC. On heating Ortho-boric forms meta boric acid and on further heathing to red hot, boric anhydrideD. It is obtained by reacting borax with `HCl`. |
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Answer» Correct Answer - A::B::C::D |
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| 59. |
Which of the following products may be formed by the reaction of diborane with ammonia/A. `(BN)_(X)`B. `B_(2)H_(6).2NH_(3)`C. `B_(3)N_(3)H_(6)` show addition reaction and produce `B_(3)N_(3)H_(9)Cl_(3)` in about which `Cl` is bonded to boronD. `B_(2)H_(6).NH_(3)` |
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Answer» Correct Answer - A::B::C |
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| 60. |
The incorrect statement among the following areA. `AlCl_(3)` exists as `Al_(2)Cl_(6)` in vapour stateB. All the `Al - Cl` bonds in `Al_(2)Cl_(6)` are equivalent below `473 K`C. Borax when strongly heated with `NH_(4)Cl` forms Boron nitride as one of the productD. `AlF_(3)` has a higher melting point while `AlCl_(3)` has lower melting point |
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Answer» Correct Answer - B |
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| 61. |
Moissan boron isA. 95-98% pure amorphous bornB. 75-78% pure amorphous boronC. 95-98% pure crystalline boronD. 75-78% pure crystalline boron |
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Answer» Correct Answer - 1 |
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| 62. |
In the icosahedron of `B_(12)` unit each boron atom is bonded to how many boron atoms. |
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Answer» Correct Answer - 5 |
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| 63. |
Borax is the sodium salt ofA. Ortho boric acidB. `B_(2)O_(3)`C. Tetra boric acidD. Pyroboric acid |
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Answer» Correct Answer - 3 |
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| 64. |
Number of tetrahedral boron atoms in colemanite is |
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Answer» Correct Answer - 4 |
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| 65. |
In dihorane total number of bonding electrons areA. 12B. 18C. 24D. 20 |
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Answer» Correct Answer - 1 |
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| 66. |
`nB_(2)H_(6) overset("excess"NH_(3))underset("athightemp.")rarr A_(("whitecrystalinesolid"))`, A is isostructural withA. BenzeneB. BorazoleC. Boron NitrateD. Graphite |
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Answer» Correct Answer - D |
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| 67. |
The following librate `H_(2)` gas when treated with `B_(2)H_(6)`.A. HCl in the presence of anhydrous `AlCl_(3)`B. `Aq.KOH`C. `H_(2)O`D. `NH_(3)` at `200^(0)C` |
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Answer» Correct Answer - A::B::C::D |
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| 68. |
`NaBH_(4) + I_(2) rarr X uarr + Y uarr + 2Nal` `X + C_(2)H_(5)OH rarr Y uarr + D` `X + HCl rarr Y uarr + E` D gives following colour with flameA. RedB. GreenC. BlueD. No colour |
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Answer» Correct Answer - B |
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| 69. |
A compound X, of boron reacts with `NH_(3)` on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating and Y are represented by the formula.A. `B_(2)H_(6),B_(3)N_(3)H_(6)`B. `B_(2)O_(3),B_(3)N_(3)H_(6)`C. `BF(3),B_(3)N_(3)H_(6)`D. `B_(3)N_(3),H_(6)B_(2)H_(6)` |
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Answer» Correct Answer - 1 |
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| 70. |
A compound of boron X reacts at `200^(@)C` temperature with `NH_(3)` to give another compound Y which is called as inorganic benzene. The compound Y is a colourless liquid and is highly light sensitive. Its melting point is `-57^(@)C`. The compound X with excess of `NH_(3)` and at a still higher temperature gives boron nitride `(BN)_(n)`. The compounds X and Y are respectively:A. `BH_(3)` and `B_(2)H_(6)`B. `NaBH_(4)` and `C_(6)H_(6)`C. `B_(2)H_(6)` and `B_(3)N_(3)H_(6)`D. `B_(4)C_(3)` and `C_(6)H_(6)` |
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Answer» Correct Answer - C |
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| 71. |
Which of the following reacts with nitrogen when heated in air Anomalous propaerrtiesA. AlB. CC. NaD. K |
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Answer» Correct Answer - 1 |
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| 72. |
Inorganic benzene isA. `B_(3)N_(3)H_(12)`B. `B_(3)N_(3)H_(6)`C. `(BN)_(6)`D. `C_(6)H_(6)Cl_(6)` |
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Answer» Correct Answer - 2 |
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| 73. |
Htree centre two electron bond is present inA. `NH_(3)`B. `B_(2)H_(6)`C. `BCl_(3)`D. `AlCl_(3)` |
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Answer» Correct Answer - 2 |
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| 74. |
A bond that does not exist in diborane isA. `Cl_(2)`B. `Br_(2)`C. `I_(2)`D. `All` |
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Answer» Correct Answer - 3 |
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| 75. |
Borax is used asA. PreservativeB. Pyrex 0C. FluxD. All |
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Answer» Correct Answer - 4 |
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| 76. |
Pickup the correct statementsA. Borazone a crystalline form of BN is even harder than diamondB. Borazine is inorganic benzeneC. Borazine on heating with a silent electric discharge gives inorganic naphthaleneD. Borazole contains `3` boron atoms and `3` Nitrogen atoms only |
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Answer» Correct Answer - A::B::C |
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| 77. |
Pickup the nido boranesA. `B_(2)H_(6)`B. `B_(5)H_(9)`C. `B_(5)H_(11)`D. `B_(8)H_(12)` |
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Answer» Correct Answer - A::B::D |
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| 78. |
Which of the following does not liberate hydrogen one reacting with acids Boron and its compoundsA. AlB. InC. TlD. B |
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Answer» Correct Answer - 4 |
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| 79. |
Boron cannot from which one of the following anions?A. `B(OH)_(4)^(-)`B. `BO_(2)^(-)`C. `BF_(6)^(3-)`D. `BH_(4)^(-)` |
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Answer» Correct Answer - 3 |
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| 80. |
Which of the following is not formed as product in the reaction ? `Na_(2)B_(4)O_(7) + 2NH_(4)Cloverset("Red hot")(rarr)`A. BNB. `B_(2)O_(3)`C. `NaCl`D. `B_(3)N_(3)H_(6)` |
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Answer» Correct Answer - D |
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| 81. |
Aqueous solution of borax reacts with two mol of acids. This is because of :A. formation of 2 mole of `B(OH)_(3)` onlyB. formation of 2 mole of `[B(OH)_(4)]^(-)` onlyC. formation of 1 mole each of `B(OH)_(3)` and `[B(OH)_(4)]^(-)`D. formation of 2 mol each of `[B(OH)_(4)]^(-)` and `B(OH)_(3)`, of which only `[B(OH)_(4)]^(-)` reacts with acid |
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Answer» Correct Answer - D |
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| 82. |
Select the incorrect statement about the boronA. Pure form of the elements are obtained by the reduction of `BCl_(3)` with zine at `900^(@)C`B. Crystalline boron is attacked only by hot concentrated oxidising agentsC. Amorphous boron and ammonia at white heat gives `(BN)_(x)`, a slippery white solid with a layer structure resembling that of graphiteD. Boron does form `B^(3+)` cation easily |
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Answer» Correct Answer - B |
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| 83. |
When `B_(2)H_(6)` reacts with excess ammonia at low temperature, select correct about product.A. Both boron are bonded with nitrogenB. One of the boron is bonded with nitrogenC. None of the boron is bonded with nitrogenD. `B_(2)H_(6)` doe not react with ammonia at low temperature |
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Answer» Correct Answer - B |
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| 84. |
Which of the following salt act as strong oxidizing agent?A. `TI^(+3)`B. `Tl^(+1)`C. `Ga^(+3)`D. `In^(+3)` |
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Answer» Correct Answer - A |
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| 85. |
Borax isA. Miscible in waterB. Immiscible inopilC. Partially soluble in cold water & fairly soluble in hot waterD. Insouble in water |
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Answer» Correct Answer - 3 |
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| 86. |
Borax is know asA. Sodium borateB. sodium tetra borrateC. Disodium tetra borrateD. All |
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Answer» Correct Answer - 4 |
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| 87. |
The substance as hard as hard as diamond isA. `B_(3)N_(3)H_(6)`B. `B_(2)H_(2)`C. `(BN)_(n)`D. `Na_(2)B_(4)O_(7)` |
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Answer» Correct Answer - 3 |
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| 88. |
Inorganic graphite isA. `(BN)_(n)`B. `BF_(4)`C. `B_(2)H_(6)`D. `B_(2)N_(2)H_(6)` |
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Answer» Correct Answer - 1 |
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| 89. |
Boric acid is polymeric due to :A. Its acidic natureB. The presence of hydrogen bondsC. Its monobasic natureD. Its geometry |
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Answer» Correct Answer - 2 |
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| 90. |
Boric acid is prepared from borax by the action of.A. HClB. NaOHC. `CO_(2)`D. `Na_(2)CO_(3)` |
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Answer» Correct Answer - 1 |
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| 91. |
Dative bonds are not present in :A. `Al_(2)Cl_(6)`B. `BF_(3)`C. BorrazoleD. `B_(2)H_(6)` |
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Answer» Correct Answer - 4 |
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| 92. |
In the tetranuclear unit of borax, `[B_(4)O_(5)(OH)_(4)]^(2-)`, the number of `B-O-B` bridges formed between `sp^(3)` borons and `sp^(2)` borons is x and the number of `B-O-B` bridges formed between `sp^(3)` borons and `sp^(3)` borons is y, then `(x-y)` = |
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Answer» Correct Answer - 3 |
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| 93. |
In which of the following the central atom is not in the `sp^(3)` hybridised state?A. Boron in solid layered boric acidB. Boron in diboareC. Boron in the product formed by the reaction of sodium hydride with diboraneD. Boron in the product formed by the addition of `(CH_(3))_(3) N` to diborane. |
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Answer» Correct Answer - A |
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| 94. |
Boric acid on heating at `150^(0)C` givesA. `B_(2)O_(3)` and `HCl`B. `H_(2)B_(4)O_(7)`C. `HBO_(2)`D. `H_(2)BO_(3)` |
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Answer» Correct Answer - B |
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| 95. |
Which of the following statement is incorrect regarding the structure of borax?A. Number of B - B bonds are zeroB. Hybridisation of each boron atom is `sp^(2)`C. Number of `B-O-B` bonds are fiveD. Two of the boron atoms are triangular planar and rest two are having tetrahedral geometry |
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Answer» Correct Answer - B |
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| 96. |
which of the following statement regarding borax is correctA. It is used in the manufacture of optical glassB. It is widely used as a flux.C. It is used in leather industryD. All are correct. |
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Answer» Correct Answer - 4 |
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| 97. |
Select the name of mineral which is used for the production of boric acidA. ChromiteB. ColemaniteC. ChalcopyriteD. Calamine |
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Answer» Correct Answer - B |
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| 98. |
which of the following metal forms a protecticive oxide layer to prevent corrosion ?A. CuB. MgC. AlD. Mn |
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Answer» Correct Answer - 3 |
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| 99. |
Which of the following forms `M_(2)O` type of oxideA. AlB. BC. `Tl`D. `Ca` |
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Answer» Correct Answer - C |
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| 100. |
The correct statement is :A. Hydroxide of aluminimum is more acidic than the hydroxide of boronB. Hydroxide of boron is basic while the hydroxide of aluminium is amphoteric.C. Hydroxide of aluminium is amphoteric since `Al-O` and `O-H` bonds have nearly same ionic charcterD. Hydroxide of boron is acidic since it ionizes in water to `BO_(3)^(3-)` land `H^(+)` ions. |
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Answer» Correct Answer - C |
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