(a)
Mond’s process is used for the purification of Ni
$Ni + 4CO\overset{\ \ Heat\ \ }{\rightarrow}\ \left\lbrack Ni(CO)_{4} \right\rbrack\overset{\ \ Decompose\ \ }{\rightarrow}Ni + 4CO$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.