MCQ
Which of the following double salt does not exist ?
- ✓$(NH_4)_2SO_4.CuSO_4 . 6H_2O$
- B$(NH4)_2SO_4. FeSO_4. 6H_2O$
- C$(NH_4) _2SO_4 . ZnSO_4. 6H_2O$
- D$(NH_4)_2SO_4. NiSO_4. 6H_2O$
The double salt $\left( NH _4\right)_2 SO _4 \cdot ZnSO _4 \cdot 6 H _2 O$ does not exist.
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$A: \left[ Ni ( en )_{3}\right]^{2+}, B :\left[ Ni \left( NH _{3}\right)_{6}\right]^{2+}, C :\left[ Ni \left( H _{2} O \right)_{6}\right]^{2+}$


$Al_{(s)}\, | Al^{+3}\, (0.1\,M)||Fe^{+2}\, (0.001\,M)|Fe_{(s)}$
If $E_{A{l^{ + 3}}/Al}^o = - 1.66\,V$ and $E_{Fe/F{e^{ + 2}}}^o = + 0.44\,V$