Question
i. $\mathrm{Ca}_2$
ii. $\mathrm{CaC}_2$
iii. $\mathrm{H}_2 \mathrm{CO}_3$
iv. $HCN$
v. $CO$

Answer

S. No.
Corbon compousds
Oxidation state
i.
$CO_2$
+4
ii.
$CaCO_3$
-1
iii.
$H_2CO_3$
+4
iv.
$HCN$
+2
v.
$CO$
+2
 

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