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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.
| 151. |
Tc the element below Mn in the periodic table, would be expected to have high values for its : (I) boiling point , (II) melting point (III) densityA. I, II and IIIB. I and II onlyC. II and III onlyD. I only |
| Answer» Correct Answer - A | |
| 152. |
The melting points and the boiling points of the transitions elements are higher than the corresponding s-block elements. This is becauseA. Transition metals have smaller sizeB. Of the presence of one or more unpaired electrons contribution to higher inter atomic forces on account of covalent bondC. of strong metalic bond due to small size and higher ionization energyD. of the presence of vacant d-orbitals |
| Answer» Correct Answer - D | |
| 153. |
The pair of compounds having metals in their highest oxidation state is:A. `MnO_(2), FeCl_(3)`B. `[MnO_(4)]^(-), CrO_(2)Cl_(2)`C. `[Fe(CN)_(6)]^(2-),[Co(CN)_(6)]^(3-)`D. `[NiCl_(4)]^(2-), [Ni(CO)_(4)]`. |
| Answer» Correct Answer - B | |
| 154. |
Among the following the coloured compound is .A. `CuCl`B. `K_(3)[Cu(CN)_(4)]`C. `CuF_(2)`D. `[Cu(CH_(3)CN)_(4)]BF_(4)` |
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Answer» Correct Answer - C `Cu^(2+) (3d^(9))` |
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| 155. |
Which group elements exhibits highest densitiesA. IIIBB. IVBC. VIBD. VIIIB |
| Answer» Correct Answer - D | |
| 156. |
Which of the following group elements exhibits high melting and boiling pointsA. IVBB. VBC. VIBD. IIB |
| Answer» Correct Answer - C | |
| 157. |
Which of the following pair of compounds is expected to exhibit same colour in aqueous solution?A. `FeCl_(3), CuCl_(2)`B. `VOCl_(2), CuCl_(2)`C. `VOCl_(2),FeCl_(2),FeCl_(2)`D. `FeCl_(2), MnCl_(2)` |
| Answer» Correct Answer - B | |
| 158. |
which metal in the first series of transition metals exhibits +1 oxidation state most frequently and why?A. CrB. CuC. CoD. Ni |
| Answer» Correct Answer - B | |
| 159. |
The pair that can exhibit more stable `+4` oxidation state isA. Fe, NiB. Ag, AuC. Pt, PdD. Cd, Hg |
| Answer» Correct Answer - C | |
| 160. |
Which one of the following does not exhibit variable oxidation states?A. ScB. CuC. CoD. Zn |
| Answer» Correct Answer - A::D | |
| 161. |
The electron which take part in order to exhibit variable oxidation states by transition metals areA. ns onlyB. `(n-1)d` onlyC. ns and `(n-1)d` but not npD. `(n-1)d` and np only but not ns |
| Answer» Correct Answer - C | |
| 162. |
Which of the following are correct about Zn,Cd,Hg I) They exhibit enthalpy of atomisation as the d-subshell is full II) Zn,Cd do not show variable oxidation states, Hg can show +1,+2 states III) Compounds of `Zn,Cd,Hg` are paramagnetic IV) They are soft metalsA. I, II, IIIB. I, IIIC. II. IVD. IV only |
| Answer» Correct Answer - C | |
| 163. |
Gold dissolves in aqua regia formingA. Auric chlorideB. Aurous chlorideC. Chloroauric acidD. Aurous nitrate |
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Answer» Correct Answer - C `HNO_(3) + 3HCl rarr 2H_(2)O + NOCl + 2[Cl]` `Au + 3[Cl] rarr AuCl_(3)` `AuCl_(3) + HCl rarr HAuCl_(4)` |
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| 164. |
Which of the following element form interstitial compounds?A. Alkali metalsB. Transition metalsC. HalogensD. Noble gases |
| Answer» Correct Answer - B | |
| 165. |
Which is not an interstitial compound?A. TiHB. `Fe_(2)O_(3)`C. `Mn_(2)C_(3)`D. `W_(2)C` |
| Answer» Correct Answer - B | |
| 166. |
Transition metal present in the alloy Gun metal isA. NiB. ZnC. SnD. Cu |
| Answer» Correct Answer - D | |
| 167. |
Which of the following is an alloy of a metal and a non-metalA. bronzeB. electronC. nichromeD. steel |
| Answer» Correct Answer - D | |
| 168. |
The alloy that is used for making permanentA. Al,Ni,CoB. Pb,Sn,BiC. Fe,Mn,CuD. Cu,Au,Hg |
| Answer» Correct Answer - A | |
| 169. |
Which of following is a true transition elementA. ZincB. CadmiumC. AluminiumD. Iron |
| Answer» Correct Answer - D | |
| 170. |
Atoms of the transition element are smaller than those of the s-block elements, because :A. there is increase in the nuclear charge along the period.B. orbital electrons are added to the penultimate d-subshell rather than to the outer shell of the atom.C. the sheilding effect of d-electrons is small.D. All of these |
| Answer» Correct Answer - D | |
| 171. |
The following does not show variable valencyA. MnB. FeC. ZnD. Cr |
| Answer» Correct Answer - B | |
| 172. |
Variable valency of transition element is on account ofA. incomplete p-orbitalsB. incomplete d-orbitalsC. completely filled d-orbitalsD. completely filled d-orbitals |
| Answer» Correct Answer - B | |
| 173. |
Which of the following is amphoteric oxide? `Mn_(2)O_(7),CrO_(3),Cr_(2)O_(3),CrO,V_(2)O_(5),V_(2)O_(4)`A. `V_(2)O_(5),Cr_(2)O_(3)`B. `Mn_(2)O_(7),CrO_(3)`C. `CrO,V_(2)O_(5)`D. `V_(2)O_(5),V_(2)O_(4)` |
| Answer» Correct Answer - A | |
| 174. |
Ferrates `[FeO_(4)]^(2-)` are formed in alkaline media but they readily decomposes toA. `Fe_(2)O_(3)` and `O_(2)`B. `FeO` and `Fe_(2)O_(3)`C. `Fe_(2)O_(3)` and `Fe_(3)O_(4)`D. `FeO` and `O_(2)` |
| Answer» Correct Answer - A | |
| 175. |
The compounds that undergo hydrolysis readily is/areA. `TiCl_(4)`B. `VCl_(5)`C. `FeCl_(3)`D. `CaCl_(2)` |
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Answer» Correct Answer - A::B::C Transition metal compounds that are covalent undergo hydrolysis. `CaCl_(2)` is ionic and no hydrolysis. |
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| 176. |
The catalyst used in the oxidation of `1^(@)` alcohol to aldehydesA. `FeSO_(4) + H_(2)O_(2)`B. `Fe + Mo`C. `Pt + Ir`D. Raney Ni |
| Answer» Correct Answer - A | |
| 177. |
The catalyst used in the polymerisation of ethylene isA. `R_(3)Al+TiCl_(4)`B. `SnCl_(4)`C. NiD. `Pt` |
| Answer» Correct Answer - A | |
| 178. |
Ferrotes are formed in alkaline medium but they readily decopose to `Fe_(2)O_(3)` and `O_(2)`. Then oxidation state of iron in ferrates isA. `+(8)/(3)`B. `+(3)/(8)`C. `+6`D. `+2` |
| Answer» Correct Answer - C | |
| 179. |
the catalyst used in the hydrogenation of oils is :A. `V_(2)O_(5)`B. `Pd`C. `Fe`D. `Ni` |
| Answer» Correct Answer - D | |
| 180. |
Transition elements show magnetic moment due to spin and orbital motion of electrons which of the following metallic ions have almost same spin only magnetic moment?A. `Co^(2+)`B. `Cr^(3+)`C. `Mn^(2+)`D. `Cr^(2+)` |
| Answer» Correct Answer - A::B | |
| 181. |
For which one of the following, observed magnetic moment is more than calculated magnetic moment (The experimental data are mainly for hydrated ions in solution)?A. `Cu^(2+)`B. `Ti^(2+)`C. `V^(2+)`D. `Cr^(2+)` |
| Answer» Correct Answer - A::B::C::D | |
| 182. |
Which of the following pair of transition metal ions, have the same calculated values of magnetic moment?A. `Ti^(+2)` and `V^(+2)`B. `Fe^(+2)` and `Cu^(+2)`C. `Cr^(+2)` and `Fe^(+2)`D. `Co^(+2)` and `Ti^(+2)` |
| Answer» Correct Answer - B | |
| 183. |
Which of the following factors may be regarded as the main cause of lanthanide contraction?A. poor shielding of one of 4f electrons by another in the subsshellB. effective shielding of one of 4f electron by another in the subshellC. poor shielding of 5d electron by 4f electronsD. poor shielding of 4f electron by 5d electron |
| Answer» Correct Answer - A | |
| 184. |
Which of the following ion is coloured?A. `Zn^(+2)`B. `Ca^(+2)`C. `Cu^(+2)`D. `Sc^(+3)` |
| Answer» Correct Answer - C | |
| 185. |
Which of the following metal ion is colour less in waterA. `V^(+2)`B. `Cr^(+3)`C. `Fe^(+2)`D. `Sc^(3+)` |
| Answer» Correct Answer - D | |
| 186. |
Which of the following is a transition elementA. AlB. AsC. NiD. Pb |
| Answer» Correct Answer - C | |
| 187. |
Colour of ferrous ion isA. RedB. BlueC. Pale greenD. Pale yellow |
| Answer» Correct Answer - C | |
| 188. |
The (n-1)d shell of electron in d-block elements is expanding and, therefore they have many physical and chemical properties in common. They show variable oxidation state and all are metals. The transition element i.e., d-block element show an unparallel tendency to form coordination compound with thhose groups which are able to donate an electron pair (i.e. lewis base). Which of the following statement is incorrect?A. Across a period from Sc to Cu the densities increase with increasing atomic number.B. The melting point of transition elements rise to a maximum from Sc to Cr and then decreases from Fe to Zn.C. Transition elements have high entahlpies of atomization and in 3d series regularly from Sc to Cu.D. On going down a group from 3d to 6d series the stability of higher oxidation state increases with increasing atomic number. |
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Answer» Correct Answer - C (A), (B) and (D) All are correct statements. There is drope in enthalpy of atomization at manganese because of half filled stable electronic configurtion leading to less mobilisation of electrons. This results in weaker metalic bonds. |
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| 189. |
The (n-1)d shell of electron in d-block elements is expanding and, therefore they have many physical and chemical properties in common. They show variable oxidation state and all are metals. The transition element i.e., d-block element show an unparallel tendency to form coordination compound with thhose groups which are able to donate an electron pair (i.e. lewis base). Which one is most acidic?A. `Cr_(2)O_(3)`B. `V_(2)O_(5)`C. `Mn_(2)O_(7)`D. `Fe_(2)O_(5)` |
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Answer» Correct Answer - C As the oxidation state of metal associated with oxygen increases, the acidic character of oxide incease. So `Mn_(2)O_(7)` is most acidic as it has higest, `+7`, oxidation state. |
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| 190. |
The following has pseudo-inert gas configuration in the `(n-1)` shell.A. Typical transition elementsB. Zinc group elementsC. BothD. Neither |
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Answer» Correct Answer - C `18e^(-)` System (psedo-Inert gas) |
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| 191. |
Which of the folllowing pairs of ions are colourelessA. `Ti^(+3),Cu^(+2)`B. `Co^(+2),Fe^(+3)`C. `Sc^(+3),Zn^(+2)`D. `Ni^(+2), V^(+3)` |
| Answer» Correct Answer - C | |
| 192. |
Which one of the following pairs of ions have the same electronic configuration?A. `Cr^(+3),Fe^(+3)`B. `Fe^(+3), Mn^(+2)`C. `Fe^(+3), Co^(+3)`D. `Sc^(+3), Cr^(+3)` |
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Answer» Correct Answer - B `Fe^(+3) 4s^(@) 3d^(5) Mn^(+2) 4s^(@) 3d^(5)` no of unpaired electrons in these two ions is same (2) |
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| 193. |
Which one of the following catalyses the reaction between iodide and persulphate ions `(2I^(-) + S_(2)O_(8)^(2-) rarr I_(2) + 2SO_(4)^(2-))`A. Fe(III)B. Fe(II)C. Fe(0)D. Cr(III) |
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Answer» Correct Answer - A `2Fe^(3+) + 2I^(-) rarr 2Fe^(2+) + I_(2)` `2Fe^(2+) + S_(2)O_(8)^(2-) rarr 2Fe^(3+) + 2SO_(4)^(2-)` |
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