Correct order of atomic Radii (Metallic radii)
Correct order of atomic Radii (Metallic radii)
- A
$Mn\, >\, Cr$
- B
$Cu\, <\, Zn$
- C
Both $(A)$ and $(B)$
- D
$Cr\, >\, Mn$
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The chief constituents of steel made in India are
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Bell metal is an alloy of
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- [AIPMT 1999]
The aqueous solution of transition metal salt changes colour from pink to blue, when concentrated hydrochloric acid is added to it. The change In colour is due to
The aqueous solution of transition metal salt changes colour from pink to blue, when concentrated hydrochloric acid is added to it. The change In colour is due to
How would you account for the following:
$(i)$ of the $d^{4}$ species, $Cr ^{2+}$ is strongly reducing while manganese $(III)$ is strongly oxidising.
$(ii)$ Cobalt $(II)$ is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.
$(iii)$ The $d^{1}$ configuration is very unstable in ions.
How would you account for the following:
$(i)$ of the $d^{4}$ species, $Cr ^{2+}$ is strongly reducing while manganese $(III)$ is strongly oxidising.
$(ii)$ Cobalt $(II)$ is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.
$(iii)$ The $d^{1}$ configuration is very unstable in ions.
Iron becomes passive by ..................... due to formation of .....................
Iron becomes passive by ..................... due to formation of .....................