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Name the transition elements with the hi...

Name the transition elements with the highest and the lowest density.

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Lowest : `Sc(2.99 g.cm^(-3))`, Highest : Ir `(22.61 g.cm^(-3))` Note that density of Os `= 22.59 g.cm^(-3)`.
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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -QUESTION - ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE)
  1. Give one use each of niobium and tantalum.

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

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

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

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

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

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

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

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

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

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  11. The extent of actinoid contraction is more than lanthanoid contraction...

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  12. Which element is used as a 'bone nail' in surgery ?

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  13. Write the ionic equation of the disproportionation reaction of CrO(4)^...

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  14. Transition metal ions have high hydration enthalpy. Explain why ?

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  15. Name the elements of the first transition series with the highest and ...

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  16. Name the transition elements with the highest and the lowest density.

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  17. Why are transition elements poor reducing agents ?

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  18. Calculate 'spin only' magnetic moment of Fe^(3+) ion.

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  19. Which elements are called ferrous metals ?

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  20. Which elements are called platinum metals ?

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