Question

Match the compounds given in List I with the oxidation state of cobalt present in it given in List II and select the correct answer using the code given below the lists:

$\quad$List I (Compounds)	$\quad$List II (Oxi. state of Co)
P. $\quad$ $[Co(NCS)(NH_3)_5]SO_3$	1. $\quad$ +4
Q. $\quad$ $[Co(NH_3)_4Cl_2]SO_4$	2.$\quad$ -1
R. $\quad$ $Na_4[Co(S_2O_3)_3]$	3. $\quad$+2
S. $\quad$ $K[Co(CO)_4]$	4. $\quad$ +3

P $\quad$ Q $\quad$ R $\quad$ S

• A. 4$\quad$1$\quad$3$\quad$2
• B. 3$\quad$4$\quad$1$\quad$2
• C. 2$\quad$3$\quad$1$\quad$4
• D. 1$\quad$3$\quad$4$\quad$2

Answer 1

Answer: (A)

Correct answer is (a) 4$\quad$1$\quad$3$\quad$2