In how many of the following, the oxidation number of cobalt is +3 ? i. Na 3[ Co ( NO 2)6] ii. [ Co ( NH 3)6] Cl 3 iii. [ Co ( en )2 Cl 2]+ iii. [ Co ( H 2 O )6]2+ v. [ CoCl 4]2- vi. [ Co ( CN )6]3-

Question

In how many of the following, the oxidation number of cobalt is +3 ? i. Na 3[ Co ( NO 2)6] ii. [ Co ( NH 3)6] Cl 3 iii. [ Co ( en )2 Cl 2]+ iii. [ Co ( H 2 O )6]2+ v. [ CoCl 4]2- vi. [ Co ( CN )6]3- (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

In complexes (i), (ii), (iii) and (vi) oxidation number of cobalt is +3.

Q. In how many of the following, the oxidation number of cobalt is $+ 3$ ?
i. $N a_{3} [C o (N O_{2})_{6}]$
ii. $[C o (N H_{3})_{6}] C l_{3}$
iii. $[C o (e n)_{2} C l_{2}]^{+}$
iii. $[C o (H_{2} O)_{6}]^{2 +}$
v. $[C o C l_{4}]^{2 -}$
vi. $[C o (CN)_{6}]^{3 -}$

In complexes $(i), (ii), (iii)$ and $(v i)$ oxidation number of cobalt is $+ 3$ .

Q. In how many of the following, the oxidation number of cobalt is +3 ? i. Na3​[Co(NO2​)6​] ii. [Co(NH3​)6​]Cl3​ iii. [Co(en)2​Cl2​]+ iii. [Co(H2​O)6​]2+ v. [CoCl4​]2− vi. [Co(CN)6​]3−

In complexes (i),(ii),(iii) and (vi) oxidation number of cobalt is +3.

Q. In how many of the following, the oxidation number of cobalt is $+ 3$ ?
i. $N a_{3} [C o (N O_{2})_{6}]$
ii. $[C o (N H_{3})_{6}] C l_{3}$
iii. $[C o (e n)_{2} C l_{2}]^{+}$
iii. $[C o (H_{2} O)_{6}]^{2 +}$
v. $[C o C l_{4}]^{2 -}$
vi. $[C o (CN)_{6}]^{3 -}$

In complexes $(i), (ii), (iii)$ and $(v i)$ oxidation number of cobalt is $+ 3$ .