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Ni^(2+) is more stable than Pt^(2+), but...

`Ni^(2+)` is more stable than `Pt^(2+)`, but `Pt^(4+)` is more stable than `Ni^(4+)`. Why? 

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AAKASH SERIES-ELEMENTS OF D - BLOCK-EXERCISE - 5.2
  1. Transition elements exhibit their highest oxidation states in oxides a...

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  2. Among Fe^(2+) and Cr^(2+), which is stronger reductant? Why?

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  3. Ni^(2+) is more stable than Pt^(2+), but Pt^(4+) is more stable than N...

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  4. Ferrous oxalate is used in developing black and white photographic fil...

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  5. In 3d-series which element has positive E(M^(2+)//M)^(@) value? Why?

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  6. Fe^(3+) can oxidise halide ions. Discuss.

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  7. Why calculated magnetic moment of Co^(2+) is less than the experimenta...

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  8. Mn^(x+) has a magnetic moment of 4.9 BM. Calculate the value of x in t...

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  9. A salt of 3d metal gave a white precipitate with NH(4)OH, but dissolve...

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  10. What is the percentage of number of ferro ions in the non-stoichiometr...

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  11. Addition of appreciable amount KMnO(4) in conc. H(2)SO(4) explodes. Ex...

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  12. An aqueous solution of Al(2)(SO(4))(3),FeSO(4) and chrome alum is heat...

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  13. E^(@) for Mn^(3+), Mn^(2+) is more positive than that for Fe^(3+), Fe^...

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  14. Amongest the bivalent ions of 3d-elements, Mn(II) shows maximum parama...

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  15. Copper is regarded as transition metal, though it has completely fille...

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  16. Compounds of iron are coloured and paramagnetic. Explain.

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  17. In 3d-series which element cannot displace hydrogen gas from dilute ac...

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  18. Mn^(3+) is less stable than Mn^(2+) and Mn^(4+) ions. Why?

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  19. Acidified dichromate solution turns green when sodium sulphide is adde...

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  20. How lanthanides differ from actinides in their oxidation states?

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