MCQ
The coordination environment of $Ca ^{2+}$ ion in its complex with EDTA ${ }^{4-}$ is :
- Atetrahedral
- Boctahedral
- Csquare planar
- Dtrigonal prismatic
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$Cu_{(s)} + 2Ag^+_{(aq)} \rightarrow Cu^{2+}_{(aq)} + 2Ag_{(s)}\,;$
$E^o = 0.46\, V$ at $298\, K$ is

$(i)$ $6C(s) + 3{H_2}(g) \to {C_6}{H_6}(l);\,\Delta H = + 45.9\,kJ$
$(ii)$ ${H_2}(g) + \frac{1}{2}{O_2}(g) \to {H_2}O(l);\,\Delta H = - 285.9\,kJ$
$(iii)$ $C(s) + {O_2}(g) \to C{O_2}(g);\,\Delta H = - 393.5\,kJ$
........$kJ$