MCQ
Which pair of metals have almost the same size?
- ✓$Cd , Hg$
- B$Cu , Zn$
- C$Sc , Ti ^{\prime}$
- D$Cr . Mo$
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[${\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{O}} =$ mass $- 18$ isotope of oxygen]
$(A)\,\,\,\,[Ni(H_2O)_5NH_3]^{2+},$
$(B)\,\,\,\,[Ni(H_2O)_4(NH_3)_2]^{2+}$ and
$(C)\,\,\,\,[Ni(H_2O)_3(NH_3)_3]^{2+}$ is


