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Acidified dichromate solution turns gree...

Acidified dichromate solution turns green when sodium sulphide is added to it. Explain.

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AAKASH SERIES-ELEMENTS OF D - BLOCK-EXERCISE - 5.2
  1. Mn^(x+) has a magnetic moment of 4.9 BM. Calculate the value of x in t...

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

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

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

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

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

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

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

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

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

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

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

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

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  14. Is any actinide has no electrons in 5f-subshell? If so name it.

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  15. What is actinoid contraction ?

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  16. Only chelate complexes of lanthanides are known, other complexes are l...

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  17. Basic nature of Lu(OH)(2) is less than that of La(OH)(3). Why?

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  18. Which lanthanide is synthetic? Write its electronic configuration.

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  19. Trivalent ions of Eu (Z = 63) and Tb (Z = 65) have same colours. Expla...

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  20. Eu^(2+) is good reductant, but Ce^(4+) is good oxidant. Explain.

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