Related InterviewSolutions

• Which element among d-block element has(i) the lowest melting point and (ii) the highest melting point
• Name the (i) lightest and the (ii) heaviest element (in terms of density)among the transition elements.
• Which of the following halides react(s) with `AgNO_(3(aq))` to give a precipitate that dissolves in `Na_(2)S_(2)O_(3(aq))`A. HClB. HFC. HBrD. `HI`
• Uub is the symbol for the element with atomic number-A. 102B. 108C. 110D. 112
• Potassium manganate `(K_2MnO_4)` is formed whenA. `Cl_(2)` is passed into an aqueous solution of `KMnO_(4)`B. `MnO_(2)` is fuesed with `KOH`C. Formaldehyde reacts with `KMnO_(4)` in the presence of strong alkaliD. `KMnO_(4)` reacts with conc. `H_(2)SO_(4)`
• Which of the following can be employed for the conversion of potassium manganate to potassium permanganate?A. `O_(3)`B. `Cl_(2)`C. `CO_(2)`D. All.
• Potassium manganate `(K_2MnO_4)` is formed whenA. chlorine is passed into aqueous `KMnO_(4)` solutionB. manganese dioxide is fused with KOH in airC. formaldehyde reacts with potassium permanganate in the presence of strong alkaliD. potassium permanganate reaction with conc. `H_(2)SO_(4)`
• Pick out the correct statement from the following: 1. Cobalt (III) is more stable in octahedral complexes. 2. Zinc forms coloured ions or complexes 3. Most of the d-block elements and their compounds are ferromagnetic. ltBrgt 4. Osmium shows (VIII) oxidation state 5. cobalt (II) is more stable in octahedral complexes.A. 1 and 2B. 1 and 3C. 2 and 4D. 1 and 4
• `{:("Element",Cr,Mn,Fe),(E^(underset(-)(o))(M^(2+)//M),-0.90V,-1.18V,-0.4V),(E^(underset(-)(o))(M^(3+)//M^(2+)),-0.41V,+1.57V,+0.8V):}` ltbr. Use this data to comment upon (i) the stability of `Fe^(3+)` and `Mn^(2+)` in acid solutions, (ii) The ease with which iron can be oxidised as compared to the similar process for either Cr or Mn metals.
• Why is the `E^(Theta)` value for the `Mn^(3+)//Mn^(2+)` couple much postive than for `Cr^(3+)//Cr^(2+) or Fe^(3+)//Fe^(2+)`? Example