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. |
Copper is purified by electrolysis in water solution and most of the impurities in the blister copper are left behind in solution. Why can not aluminium be unpaired in a similar manner ?A. Because Al ions are not produced in solutionB. Because Al ions are not reduced by electrolysis in a water solutionC. Because very few Al ions are reduced in water solutionD. None of the above |
| Answer» Correct Answer - B | |
| 2. |
An alkali metal hybride `(NaH)` reacts with diborane in Y to give a tetrahedral compound Z, which is extensively used as reducing agent in organic synthesis. The Y and Z in the above reaction areA. `C_(2)H_(6), C_(2)H_(5)Na`B. `C_(2)H_(5)-O-C_(2)H_(5), NaBH_(4)`C. `NH_(3), B_(3)N_(3)H_(6)`D. `C_(3)H_(8), C_(3)H_(7)Na` |
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Answer» Correct Answer - B The required reaction is `2NaH+B_(2)H_(6)underset((Y))(("In "C_(2)H_(5)-O-C_(2)H_(5)))rarr underset((Z))(2Na^(+)[BH_(4)]^(-)) ("tetrahedral " BH_(4)^(-) " ion")` |
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| 3. |
The types of hybridisation of boron in diborane isA. sp-hybridisationB. `sp^(2)`-hybridisationC. `sp^(3)`-hybridisationD. `sp^(3)d^(2)`-hybridisation |
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Answer» Correct Answer - C In diborane each B atoms is `sp^(3)`-hybridised. |
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| 4. |
Name a metal other than aluminium that is covered with a layer of oxide film.A. AlB. AgC. AuD. Fe |
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Answer» Correct Answer - A Out of the given four metals (Al, Ag, Au Fe) only Al is protected by a layer of its own oxide. |
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| 5. |
The major role of fluorspar, which is added in small quantities in the electrolytic reduction of `Al_(2)O_(3)` dissolved in fushed cryolite isA. as a catalystB. to make the fused mixture very condutingC. to lower the fusion temperature of metalD. to decreases the ate of oxidation of carbon at the anode. |
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Answer» Correct Answer - B::C Fluorospar `(CaF_(2))` is added in small quantities to be melt in the extraction of Al. It makes the fused state more conducting. It lowers the s fusion temperature of the melt. |
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| 6. |
Which of the following is not correct in case of Boron nitride?A. It is also called borazoneB. It has magnetic propertiesC. It is hard because it has diamond like structureD. It is chemically unreactive |
| Answer» Correct Answer - B | |
| 7. |
Both boron and aluminium show difference in properties from the remaining members of group 13. This becauseA. both B and Al have smaller size as compared to other members of the familyB. both B and Al have high values of ionization energyC. both B and Al have 2 and 8 electrons in their last but one shell respectively but the electrons in their last but one shellD. none of these |
| Answer» Correct Answer - C | |
| 8. |
Which metal is protected by layer of its ownA. GoldB. AluminiumC. CopperD. Iron |
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Answer» Correct Answer - B Aluminium is protected due to formation of a layer of `Al_(2)O_(3)` on its surface. |
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| 9. |
Assertion (A) : In water, orthoboric acid acts as a weak monobasic acid. Reason (R) : In water orthoboric acid acts as a proton donor.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true |
| Answer» Correct Answer - C | |
| 10. |
Inert pair effect plays an important role in case ofA. FB. AlC. SiD. Tl |
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Answer» Correct Answer - D Tl shows +1 and +3 oxidation state due to inert pair effect. |
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| 11. |
The electropositive first increases from B to Al and then decreases from Al to Tl own the group because ofA. decrease in ionization energy of the elementsB. increase in size of the elementsC. ineffective shielding of nuclear charge by d-electrons in case of Ga, In and Tl due to which the valence electrons are tightly held and are not lost easily.D. decrease in electronegatively of the elements. |
| Answer» Correct Answer - C | |
| 12. |
Inert pair effect is observedA. When an element shows inertness in chemical combinationB. When a bond pair of electrons is present in the elementC. When the teo s electrons remain paired and do not participate in bondingD. When non-metallic character decreases |
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Answer» Correct Answer - C The reluctance of ns electrons to take part in bonding is called inert pair effect. In inert pair effect two ns electrons remained paired and are not involved in bonding. |
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| 13. |
Assertion (A) : `Tl^(3+)` acts as an oxidising agent. Reason (R) : Due to inert pair effect `Tl^(+)` is more stable than `Tl^(3+)`.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true |
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Answer» Correct Answer - A Both assertion and reason are correct. |
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| 14. |
Which is used in high temperature thermometry ?A. SnB. AsC. HgD. Ga |
| Answer» Correct Answer - D | |
| 15. |
Which is used in high temperature thermometry ?A. NaB. GaC. TlD. Hg |
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Answer» Correct Answer - B Ga is used in high temperature thermometry. |
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| 16. |
Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because.A. It is a noble metalB. Oxygen forms a protective oxide layerC. Iron undergoes reaction easily with waterD. Fe forms mono and divalent ions. |
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Answer» Correct Answer - B The lesser (or almost no) corrosion of Al as compared to Fe is due to the formation of a protective oxide cover over Al. |
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| 17. |
Aluminium chloride acts as a strong Lewis acid becauseA. `AlCl_(3)` is a covalent compoundB. `AlCl_(3)` is an ionic compoundC. `AlCl_(3)` is an electron deficient compoundD. `AlCl_(3)` is easily hydrolysed |
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Answer» Correct Answer - C `AlCl_(3)` is an electron deficient compound and acts as Lewis acid. |
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| 18. |
Aluminium chloride exits as a dimer because aluminium has :A. It has better reflecting power than AgB. It does not scratchC. Coating is much smootherD. It does not tarnish in air |
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Answer» Correct Answer - D It does not tarnish in air. |
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| 19. |
The dissolution of `Al(OH)_(3)` by a solution of `NaOH` results in the formation ofA. `[Al(H_(2)O)_(4)(OH)]^(2+)`B. `[Al(H_(2)O)_(3)(OH)_(3)]`C. `[Al(H_(2)O)_(2)(OH)_(4)]^(-)`D. `[Al(H_(2)O_(6)](OH)_(3)` |
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Answer» Correct Answer - C `Al(OH)_(3)+OH^(-) rarr [Al(OH)_(4)]^(-)` or `[Al(OH)_(4)(H_(2)O)_(2)]^(-)` |
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| 20. |
Aqueous ammonia is used as a precipitating reagent for `Al^(3+)` ions as `Al(OH)_(3)` rather than aqueous NaOH, becauseA. `NH_(4)^(+)` is a weak baseB. `NaOH` is a very strong baseC. NaOH form `[Al(OH)_(4)]^(-)` ionsD. NaOH forms `[Al(OH)_(2)]^(+)` ions |
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Answer» Correct Answer - C `Al(OH)_(3)+OH^(-) overset(NaOH)rarr [Al(OH)_(4)]^(-)` |
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| 21. |
When borax is heated strongly it givesA. `B_(2)O_(3)`B. `Na_(2)B_(4)O_(7)`C. `NaBO_(2)`D. `NaBO_(2)+B_(2)O_(3)` |
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Answer» Correct Answer - D `underset("Borax")(NA_(2)B_(4)O_(7)) overset(Delta)rarr underset("Sodium metaborate")(2NaBO_(2))+B_(2)O_(3)` |
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| 22. |
What is the molecular formula of Borazole ?A. `B_(2)H_(6)`B. `B_(6)N_(6)H_(6)`C. `B_(3)N_(3)H_(6)`D. `B_(3)N_(3)H_(6)` |
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Answer» Correct Answer - C Molecular formula of borazole is `B_(3)N_(3)H_(6)` |
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| 23. |
In borax `(Na_(2)B_(4)O_(7).10H_(2)O)` the number of `B-OH` bonds present is :A. fiveB. fourC. threeD. two |
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Answer» Correct Answer - B Correct formula of borax is , `Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O` Thus, number of `B-OH` bonds = 4. |
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| 24. |
The electronic configuration of Gallium isA. `[Ar] 3d^(10) 4s^(2)`B. `[Ar] 3d^(9) 4s^(1)`C. `[Ar] 3d^(10) 4s^(1)`D. `[Ar] 3d^(10) 4s^(2) 4p^(1)` |
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Answer» Correct Answer - D `._(31)Ga: [._(18)Ar] 3d^(10) 4s^(2) 4p^(1)`. |
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| 25. |
Which of the following do not sublime on heating ?A. `AlF_(3)`B. `AlCl_(3)`C. `AlBr_(3)`D. `AlI_(3)` |
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Answer» Correct Answer - A::D Only `AlCl_(3)` sublimes on heating. |
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| 26. |
Corundum isA. `Al_(2)(SO_(4))_(3)`B. `Al_(2)O_(3).H_(2)O`C. `Al_(2)O_(3).2H_(2)O`D. `Al_(2)O_(3)` |
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Answer» Correct Answer - D Corundum is `Al_(2)O_(3)`. |
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| 27. |
Which out of the following reactions does not take place ?A. `4Al + 3O_(2) rarr 2Al_(2)O_(3)`B. `2Al+Fe_(2)O_(3) rarr Al_(2)O_(3) + 2Fe`C. `Al_(2)O_(3)+2Cr rarr Cr_(2)O_(3)+2Al`D. `8Al+3Mn_(3)O_(4) rarr 4Al_(2)O_(3)+9Mn` |
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Answer» Correct Answer - C Al has higher affinity for oxygen than chromium, hene Cr cannot displace `Al` from its oxides. |
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| 28. |
Which of the following has largest size ?A. AlB. `Al^(+)`C. `Al^(2+)`D. `Al^(3+)` |
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Answer» Correct Answer - A Size of a neutral atom is always larger than its cations. |
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| 29. |
Which is wrong?A. Anhyd. `AlCl_(3)` exists as `Al_(2)Cl_(6)` (dimer)B. Anhyd. `AlCl_(3)` sublimes on heatingC. Anhyd. `AlCl_(3)` fumes in airD. Anhyd. `AlCl_(3)` is ionic |
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Answer» Correct Answer - D Anhydrous `AlCl_(3)` is a covalent compound. It is not an ionic compound. |
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| 30. |
Adamantive is the crystalline form ofA. AluminiumB. BoronC. ThalliumD. Beryllium |
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Answer» Correct Answer - B Adamantive is the crystalline form of boron. |
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| 31. |
Borazine (Inorganic benzene) is the product of reaction betweenA. Boron and hydrogenB. Boron and AmmoniaC. Diborane and nitrogenD. Diborane and ammonia |
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Answer» Correct Answer - D `3B_(2)H_(6)+6NH_(3) overset(450K)rarr underset("Borazine")(2B_(3)N_(3)H_(6))+12H_(2)` |
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| 32. |
Which of the following is false about `B_(2)H_(6)`?A. it contains two types of H atomsB. it contains B-B covalent bondC. Rotation of B-B axis is not possibleD. The Two boron atoms along with four Hatoms lie in one plane |
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Answer» Correct Answer - B Instead it contains `B-H-B` Banana bond which is a three centres two electron bond. |
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| 33. |
Diborane upon hydrolysis givesA. Boric anhydrideB. Metaboric acidC. Orthoboric acidD. Boron oxide |
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Answer» Correct Answer - C `B_(2)H_(6) + 6H_(2)O rarr 2H_(3)BO_(3)+6H_(2)` |
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| 34. |
Which of the following statements is not true for Al and B ?A. They burn in oxygen to give oxides at higher temperatureB. Their halides are Lewis acidsC. They combine with nitrogens to form nitridesD. They react with HCl to give chloride. |
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Answer» Correct Answer - D Boron does not react with HCl to give its chloride. |
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| 35. |
Which of the following statements is false ?A. Boron trifluoride is a strong Lewis baseB. Aluminium is a good reducing agentC. Boron resembles silicon in many respectsD. Boron does not form `B^(3+)`. |
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Answer» Correct Answer - A `BF_(3)` acts as lewis acid and not as Lewis base. |
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| 36. |
Which of the metal chlorides has maximum covalent character ?A. `NaCl`B. `AlCl_(3)`C. `CsCl`D. `BaCl_(2)` |
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Answer» Correct Answer - B The covalent character of chlorides increases along a period and decreases down a group. |
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| 37. |
The element which shows least metallic character isA. IndiumB. BoronC. AluminiumD. Gallium |
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Answer» Correct Answer - B When we mmove down the group, the IE decreases, the electropositive character, hence the metallic character also increases. |
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| 38. |
Which one of the following elements has the highest melting point?A. BoronB. AluminiumC. GalliumD. Thallium |
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Answer» Correct Answer - A Boron has a giant molecule structure like that of diamond so it has highest melting point. |
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| 39. |
Which of the following configurations is characteristic of group 13 elements?A. `ns^(2) np^(1)`B. `(n-1) d^(10) ns^(2) np^(2)`C. `(n-1)d^(1) ns^(2)`D. `[Ar] 3d^(10) 4s^(2) 4p^(1)` |
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Answer» Correct Answer - A `ns^(2)np^(1)` that is three electrons in their valence shell. |
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| 40. |
Generally the atomic and ionic radii increase with increase in atomic number down the group. But the atomic size of aluminium and gallium is almost the same. This is becauseA. the high nuclear charge of Ga and TlB. the intervening d and f electronsC. high ionization energies of these elementsD. none of these |
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Answer» Correct Answer - B Because of ineffective shielding of nuclear charge by d electrons in case of Ga, In and Tl due to which the valence electrons are tightly held. |
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| 41. |
`AlCl_(3)` isA. Anhydrous and covalentB. Anhydrous and ionicC. Covalent and basicD. Coordinate and acidic |
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Answer» Correct Answer - A `AlCl_(3)` is anhydrous and covalent. |
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| 42. |
Which of the following statements about inorganic naphthalene is false?A. Inorganic naphthalene is `B_(5)N_(5)H_(8)`B. It is prepared from inorganic benzene by passing silent electric discharge through itC. Its structure is analogous to naphthaleneD. All the above statements are incorrect. |
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Answer» Correct Answer - D All the options (A), (B) and (C) are correct for inorganic naphthalene hence option (D) is the required answer. |
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| 43. |
Two elements X and Y react separately with highly electropositve metal to form binary compounds, which upon hydrolysis yield mixture of boranes and silances. X and Y respectively areA. B, SiB. Si, BC. Al, BD. B, Al |
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Answer» Correct Answer - A See Comprehensive Review in diagonal relationship between B and Si. |
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| 44. |
Corundum is an ore ofA. CopperB. BoronC. AluminiumD. Sodium |
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Answer» Correct Answer - C Corundum is `(Al_(2)O_(3))` is an ore of aluminium. |
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| 45. |
The chief ore of aluminium isA. CryoliteB. FeldsparC. KaolinD. Bauxite |
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Answer» Correct Answer - D Bauxite `(Al_(2)O_(3).2H_(2)O)` is the chief ore of aluminium. |
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| 46. |
Which of the following is the electron deficient molecule ?A. `C_(2)H_(6)`B. `SiH_(4)`C. `PH_(3)`D. `B_(2)H_(6)` |
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Answer» Correct Answer - D `B_(2)H_(6)` is electron deficient. |
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| 47. |
The compounds of boron and hydrogen are collectively calledA. DiboranesB. BorazolesC. BoracitsD. Boranes |
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Answer» Correct Answer - D Compounds of B and `H_(2)` called boranes with general formula `B_(n)H_(n+4)` and `B_(n)H_(n+6)` |
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| 48. |
Which out of the following is potash alum ?A. `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`B. `K_(2)SO_(4)Cr_(2)[SO_(4)]_(3).24H_(2)O`C. `K_(2)SO_(4).Fe_(2)[SO_(4)]_(3).24H_(2)O`D. `[NH_(4)]_(2)SO_(4).FeSO_(4).6H_(2)O` |
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Answer» Correct Answer - A `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` is potash alum. |
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| 49. |
Group 13 element with lowest melting point isA. BB. TlC. AlD. Ga |
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Answer» Correct Answer - D Group 13 element with lowest melting point is Ga. |
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| 50. |
Out of the following group 13 elements, element with smallest atomic radius isA. AlB. GaC. InD. Tl |
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Answer» Correct Answer - B Out of Al, Ga, In and Tl element with smallest atomic radius is GA. Atomic radius of Ga is less than Al. |
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