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In quantitative analysis of Fe^(2+) ions...

In quantitative analysis of `Fe^(2+)` ions with standard `KMnO_(4)` solution, HCl is not used to acidify - why ?

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This is because `KMnO_(4)` oxidises not only `Fe^(2+)` to `Fe^(3+)` but also HCl to `Cl_(2)`.
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(1) MnO_(4)^(-)(aq)+8H^(+)(aq)+5e rarr Mn^(2+)(aq)+4H_(2)O(l), E^(@)=+1.51V (2) Cr_(2)O_7)^(2-)(aq)+14H^(+)+6e rarr 2Cr^(3+)(aq)+7H_(2)O(l), E^(@)=+1.38V (3) Cl_(2)(g)+2e rarr 2Cl^(-)(aq), E^(@)=+1.40V KMnO_(4) and K_(2)Cr_(2)O_(7) both are well known oxidising agent and used in quantitative analysis. If a solution of a reducing agent contains HCl, which one between these two should not be used as an oxidising agent?

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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -QUESTION - ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE)
  1. The atomic of an element is 102. Show the outer electronic configurati...

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  2. Why are most transition metal ions paramagnetic ?

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  3. In quantitative analysis of Fe^(2+) ions with standard KMnO(4) solutio...

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  4. On reaction with the following compounds, sodium cyanide gives sodium ...

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  5. Name one ore each of chromium and manganese.

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  6. Explain why lanthanoids and actinoids are called f-block elements ?

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  7. Why do Zr(Z = 40) and Hf(Z = 72) have comparable atomic radii ?

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  8. In aqueous solution, which is the most stable oxidation state of titan...

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  9. Name the lightest and the heaviest transition elements.

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  10. Name the largest trivalent ion that exists between lanthanum (Z = 57) ...

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  11. Give one use each of niobium and tantalum.

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  12. Among Fe^(2+) and Fe^(3+), which is more stable ? Why ?

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  13. Which bivalent transition metal ion in the 3d-series is the most param...

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  14. Why is the ionic radius of Fe^(2+) less than that of Mn^(2+) ?

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  15. Name a lanthanoid that exhibits + 4 oxidation state.

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  16. Why is KMnO(4) kept in dark coloured bottles ?

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  17. What happens when the pH of K(2)Cr(2)O(7) solution is increased ? Give...

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  18. Classify the following as d-block elements, lanthanoids and actinoids ...

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  19. Which has the highest density ? Al, Mg, Cu, Ni, Fe

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  20. Substances made of copper form green coloured coating when left in moi...

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