InterviewSolution
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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.
| 1. |
`H_(3)BO_(3)` dissolves in liquid HF due to formation of compound X. The hybridisation of central atom in compound X is ,A. `sp^(3)`B. `sp^(2)`C. `sp` & `sp`D. `sp^(3)d` |
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Answer» Correct Answer - A |
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| 2. |
The geometry of a complex species can be understood from the knowledge of type of hybridisation of orbitals of central atom. The hybridisation of orbitals of central atom in `[B(OH_(4))]^(-)` and the geometry of the complex are respectively.A. `sp^(3)`, tetrahedralB. `sp^(3)`,squre plannarC. `sp^(3)`d^(2),octahedralD. `dsp^(2)`,square planar |
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Answer» Correct Answer - 1 |
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| 3. |
Some statements about the structur of diborane are given below . NMR and RAMAN spectral studies have confirmed that four hydroens of diborance are one tuype and remaing two are of another type B) Electron diffraction studies have shown that diborance contains two copanar `BH_(2)` groupsc) Diborane is a planar molecule D) Boron of dibrane ujndergoes `sp^(2)` hybridisation . the correct statement areA. Only A and BB. Only A,B,CC. Only B,C,DD. All are correct |
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Answer» Correct Answer - 1 |
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| 4. |
In diborane, the two `H-B-H` angles are nearlyA. `60^(@),120^(@)`B. `97^(@),120^(@)`C. `95^(@),150^(@)`D. `120^(@),180^(@)` |
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Answer» Correct Answer - 2 |
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| 5. |
In the structure of diboraneA. All hydrogen atoms lie in one plane and boron atoms lie in a plane perpenduicular to this planeB. 2 boron atoms and 4 terminal hydrogen atoms lie in the same plane and 2 bridging hydrogen atoms lie in the perpendicular planeC. 4 bridging hydrogen atoms and boron atoms lie in one plane and two terminal hydrogen atoms lie in a plane perpendicular to this planeD. All the atoms are in the same plane |
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Answer» Correct Answer - 2 |
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| 6. |
The types of hybridisation of boron in diborane isA. spB. `sp^(2)`C. `sp^(3)`D. `sp^(3)d` |
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Answer» Correct Answer - 3 |
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| 7. |
Which of the following combinations is not suitable for the preparation of DiboraneA. `NaBH_(4)` & `I_(2)`B. `Ca(OH)_(2)` & `BCl_(3)`C. `BCl_(3)` & `H_(2)`D. `BF_(3) + LiH` |
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Answer» Correct Answer - B |
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| 8. |
`B_(2)H_(6)` on reaction with tri methyl amine from a compound `X`. Hybridisation of B and N in that compound X isA. `sp^(3)` & `sp^(2)`B. `sp^(2)` & `sp^(2)`C. `sp` & `sp`D. `sp^(3)` & `sp^(3)` |
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Answer» Correct Answer - D |
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| 9. |
Aluminium chlorde exists as dimer, `Al_(2)Cl_(6)` in solid state as well as in solutin of non-polar solvents such as benzene. When dissolved in waer it gives :A. `Al^(3+) + 3Cl^(-)`B. `[Al(H_(2)O)_(6)]^(3+) + 3Cl^(-)`C. `[Al(H_(2)O)_(6)]^(3+) + 3HCl`D. `Al_(2)O_(3) + 6HCl` |
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Answer» Correct Answer - B |
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| 10. |
`TI_(3)` is an ionic compound which furnishesA. `Tl^(+)` & `I_(3)^(-)` ionsB. `Tl^(3+)` & `I_(3)^(-)` ionsC. `Tl^(3+)` & `I^(-)` ionsD. `Tl^(+)` & `I^(-)` ions |
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Answer» Correct Answer - A |
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| 11. |
Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because.A. Aluminimum is a noble metalB. Oxygen forms a protective oxide layerC. Iron undergoes reaction easily with waterD. Iron undergoes reaction easily with water |
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Answer» Correct Answer - B |
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| 12. |
The total numbe of tetrahedral and trigonal planar units in borax is…….. |
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Answer» Correct Answer - 4 |
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| 13. |
A mixture of ethyl alcohol and boric acid burn with green edged flame. The green edged flame containsA. Triethyl borateB. ethyl borideC. AcetaldehydeD. diborane |
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Answer» Correct Answer - A |
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| 14. |
Identity the correct statement (s) based on the folowing standard electrode potential `(E^(0)` value: `E^(0)_(AI^(3+))//AI=-1.66V,E^(0)_(TI^(3+))//TI=+1.26V` I. Aluminium has least tendency to make `AI^(3+)`(aq)ions II `TI^(+)` is unstable in solution and is a powerful oxidizing agent III `TI^(+)` is more stable in solution than `TI^(3+)` IV TI is more electropositive than AIA. I and IV onlyB. II onlyC. II and III onlyD. I and III only |
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Answer» Correct Answer - 3 |
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| 15. |
A white precipitate (X) is formed when a mineral of Boron (W) is bolied with `Na_(2)CO_(3)` solution. The precipitate is filtered and the filtered contains two compounds (Y) and (Z). The compound (Y) is removed by crustallization. By passing `CO_(2)` through `(Z)` changes to (Y). The compound (Y) on strong heating givesA. `NaAlO_(2)+Al_(2)O_(3)`B. `NaBO_(2) + B_(2)O_(3)`C. `Na_(2)SO_(4) + H_(3)BO_(3)`D. `CO(BO_(2))_(2)` |
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Answer» Correct Answer - B |
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| 16. |
A compound (A) of boron reacts with `Nme_(3)` to give an adduct B and on hydrolysis gives a compound C and hydrogen gas. Compound C is an acid. Then A,B and C are respectivelyA. `B_(2)H_(6),Me_(3)N to BF_(3),H_(3)BO_(3)`B. `B_(2)H_(6),Me_(3)N to BF_(3),B(OH)_(4)^(-)`C. `H_(2)B_(4)O_(7),Me_(3)NtoBF_(3),B(OH)_(3)`D. HBO_(2),MeNtoBF_(3),B(OH)_(3)` |
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Answer» Correct Answer - 1 |
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| 17. |
A white precipitate (X) is formed when a mineral (A) is boiled with `Na_(2)CO_(3)` solution. The precipitate is filtered and filtrate contains two compound (Y) and (Z). The compound (Y) is removed by crystallization and when `CO_(2)` is passed through the filtrate obtained after crystallization, then `(Z)` changed to `(Y)`. When compound (Y) is heated, it gives two compounds (Z) and (T). Compound (T) on heating with cobalt oxide produces blue coloured substance (S) The compound (Y) in the filtrate when (A) is boiled with `Na_(2)CO_(3)` isA. `NaBO_(2)`B. `Na_(2)B_(4)O_(7)`C. `Na_(3)BO_(3)`D. `CaO` |
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Answer» Correct Answer - B |
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| 18. |
Kernite is a mineral containingA. AluminiumB. GalliumC. BorronD. Silicon |
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Answer» Correct Answer - 3 |
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| 19. |
The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature isA. BB. AlC. GaD. In |
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Answer» Correct Answer - 3 |
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| 20. |
(All products from P to related to Boron. The by products are not included) The compound X is |
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Answer» Correct Answer - A |
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| 21. |
Which one of the following is summer liquidA. AlB. GaC. TlD. C |
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Answer» Correct Answer - 2 |
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| 22. |
Bauxite is an oxide mineral ofA. BariumB. BoronC. BismuthD. Aluminium |
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Answer» Correct Answer - 4 |
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| 23. |
Borax is actually made of two tetrahedral and tetrahedral and two triangular units joined together and should be written as `Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O` Select incorrect statement:A. Borax is used as a buffeB. 1M borax solution reacts with equal volumes of 2M HCl solutionC. Titration of borax can be made using methyl orange asd the indicatorD. In borax all boron atoms are `sp^(3)` hybridised |
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Answer» Correct Answer - D |
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| 24. |
Borax is actually made of two tetrahedral and tetrahedral and two triangular units joined together and should be written as `Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O` Consider following statements about borax: (1) Each boron atom has four `B - O` bonds (2) Each boron atom has three `B - O` bonds (3) Two boron atoms have four `B - O` bonds while other two have three `B - O` bonds (4) Each boron atom has one `-OH` group Select correct statement(s) :A. `1,2`B. `2,3`C. `3,4`D. `1,3` |
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Answer» Correct Answer - C |
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| 25. |
Borax is actually made of two tetrahedral and tetrahedral and two triangular units joined together and should be written as `Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O` Consider following statements about borax: (1) Each boron atom has four `B - O` bonds (2) Each boron atom has three `B - O` bonds (3) Two boron atoms have four `B - O` bonds while other two have three `B - O` bonds (4) Each boron atom has one `-OH` group Select correct statement(s) :A. `i,ii`B. `ii,iii`C. `i,iii`D. `iii,iv` |
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Answer» Correct Answer - D |
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| 26. |
The most stable oxidation state of thallium is +1A. `+1`B. `+3`C. `+4`D. `+6` |
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Answer» Correct Answer - 1 |
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| 27. |
Thallous choride is more stable than thallic choride because ofA. More ionic characterB. Largersize of `Tl^(+)` ionC. High hydration energy of `TI^(+)` IonD. Inert pair effect. |
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Answer» Correct Answer - 4 |
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| 28. |
Reduction of `117.5 g BCl_(3)` by `H_(2)` in silent electric discharge produces `HCl`, which required `500 mL` of `xM NaOH` for neutralization. Report `x`. |
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Answer» Correct Answer - 6 |
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| 29. |
The mixture of `BCl_(3)` vapour and hydrogen gas is subjecteed to electric doscharge . The chief products areA. B,HClB. `B_(2)H_(6),HCl`C. `B_(2) H_(5)Cl,HCl`D. `B_(2)H_(4)CL_(2),HCl` |
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Answer» Correct Answer - 2 |
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| 30. |
The chief impurity present in bauxite isA. FEOB. `Fe_(2)O_(3)`C. `SiO_(2)`D. `AlCl_(3)` |
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Answer» Correct Answer - 3 |
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| 31. |
In borax the number of water molecules present outside the coordination sphere is x and inside the coordination sphere is y , then `x-y =` |
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Answer» Correct Answer - 8 |
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| 32. |
Aluminate ion in aqueous solution actually exixits asA. `[Al(OH)_(6)]^(3-)`B. `[Al(OH)_(4)(H_(2)O)_(2)]^(-)`C. `[Al(OH)_(3)(H_(2)O)_(3)]^(-)`D. `[Al(OH)_(5)(H_(2)O)]^(2-)` |
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Answer» Correct Answer - 1 |
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| 33. |
which of the following is the most stable oxidation state of alumium (AFMC99)A. `-1`B. `+1`C. `+2`D. `+3` |
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Answer» Correct Answer - 4 |
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| 34. |
Aluminium vessels should not be washed with materials containing washing soda because:A. Washing soda is exensiveB. Washing soda is easily decomposedC. Washing soda reacts with aluminium to form soluble aluminteD. Washing soda reacts with aluminium to form insoluble aluminium oxide |
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Answer» Correct Answer - 3 |
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| 35. |
In aluminate ion , coordination number of aluminium isA. 2B. 4C. 6D. 1 |
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Answer» Correct Answer - 3 |
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| 36. |
The chief ore of aluminium isA. AluniteB. BauxiteC. CryoliteD. Felsper |
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Answer» Correct Answer - 2 |
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| 37. |
Which of the statement sbout aluminium is not correctA. It liberates hydrogen from acids as well as alkaliesB. It liberates hydrogen from acids but not from alkaliesC. It liberates hydrogen from hot alkali solutionD. It liberates hydrogen from boiling water. |
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Answer» Correct Answer - 2 |
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| 38. |
The chemical formula of diaspore an ore of alumium isA. `Al_(2)O_(3).3H_(2)O`B. `Al_(2)O_(3).2H_(2)O`C. `Al_(2)O_(3).H_(2)O`D. `Al_(2)O_(3)` |
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Answer» Correct Answer - 3 |
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| 39. |
Which of the following minerals does not contain aluminium ?A. MicaB. CryoliteC. FelsparD. Fluorspar |
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Answer» Correct Answer - 4 |
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| 40. |
In the aluminothermic proces , aluminium acts asA. An oxidising agentB. A fluxC. A reducing agentD. Asoler |
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Answer» Correct Answer - 3 |
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| 41. |
Blanc fixe used in paints isA. FeB. SnC. AgD. Al |
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Answer» Correct Answer - 4 |
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| 42. |
Aluminium becomes passive inA. Conc.`HNO_(3)`B. `H_(2)CrO_(4)`C. `HClO_(4)`D. Conc. `HCl` |
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Answer» Correct Answer - A::B::C |
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| 43. |
Assertion (A) : Aluminum is passive towards conc ` HNO_3` Reason (R) : Due to formation of layer of nitrate on aluminiumA. AlNB. `Al_(2)S_(3)`C. `Al_(4) C_(3)`D. `Al_(2)O_(3)` |
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Answer» Correct Answer - 4 |
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| 44. |
Reactivity of borazole is greater than that of benzene becauseA. Borazole contains polar bondsB. Borazole contains non polar bondsC. Borazole is an electron rich compoundD. Both B and N are in `sp^(3)` hybridised states. |
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Answer» Correct Answer - A |
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| 45. |
Borazole is an isoster ofA. BenzeneB. propaneC. NaphthealineD. phenol |
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Answer» Correct Answer - 1 |
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| 46. |
Borazole contains the following bondsA. `9sigma,6pi1`B. `6sigma,9pi`C. `12sigma,3pi`D. `15sigma,0pi` |
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Answer» Correct Answer - 3 |
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| 47. |
Reactivity of borazole is greater than that of benzene becauseA. Bonds in Borazole are non-polarB. Bonds in Borazole are polarC. Borazole is aromatic compoundD. Electrons are localized in it |
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Answer» Correct Answer - B |
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| 48. |
Duralumin is an alloy ofA. Al+MgB. Al+Cu+Mg +MnC. Al+Zn+Mg+NiD. Al+Cu |
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Answer» Correct Answer - 2 |
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| 49. |
Which of the following are true about diborane ?A. It has two bridging hydrogen and four terminal hydrogensB. When methylated, the product is `Me_(4)B_(2)H_(2)`C. The bridging hydrogen are in a plane perpendicular to the restD. All the six B-H bond distances are equal |
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Answer» Correct Answer - A::B::C |
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| 50. |
Which is not correct in case of Be and Al ?A. Both are rendered passive by conc,`HNO_(3)`B. Carbides of both give methane on hydrolysisC. Both give hydroxides which are basicD. Both give covalent chorides |
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Answer» Correct Answer - 3 |
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