MCQ
Like other elements of d group, Zn does not show variable valence, because :
- AIt is a soft metal.
- ✓The d-orbital is completely filled in it.
- CIts melting point is low.
- DThere are two electrons in its outermost orbital.
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$E_{{A^{3 + }}/A}^o = 1.50\,\,V\,,$ $E_{{B^{2 + }}/B}^o = 0.3\,\,V,$
$E_{{C^{3 + }}/C}^o = - \,0.74\,\,V,$ $E_{{D^{2 + }}/D}^o = - \,2.37\,\,V.$
The correct sequence in which the various metals are deposited at the cathode is
Which of the following statement is true for the compounds $[X ], [Y]$ and $[Z]$ ?