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Name the element which does not exhibit ...

Name the element which does not exhibit variable oxidation state in the 3d-block.

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After the loss of two electrons, `Zn(3d^(10)4s^(2))` forms `Zn^(2+)` ion `(3d^(10)4s^(0))` with stable electronic configuration (3d-subshell fully filled). So Zn shows oxidation state of + 2 only and does not exhibit variable oxidation state.
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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -QUESTION - ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE)
  1. Mention the highest oxidation state shown by the transition elements. ...

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  2. What is the difference between the numerical values of the successive ...

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  3. Name the element which does not exhibit variable oxidation state in th...

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  4. Name the compound that evolves as vapours when NaCl is heated with K(2...

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  5. The atomic of an element is 102. Show the outer electronic configurati...

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  6. Why are most transition metal ions paramagnetic ?

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

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

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  9. Name one ore each of chromium and manganese.

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

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

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

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  13. Name the lightest and the heaviest transition elements.

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

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  15. Give one use each of niobium and tantalum.

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

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

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

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

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

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