JEE Main & Advanced
Chemistry
Analytical Chemistry
Question Bank
Preliminary Test
question_answer
Which one of the following metals will give blue ash when its salt is heated with \[N{{a}_{2}}C{{O}_{3}}\] solid and \[Co{{\left( N{{O}_{3}} \right)}_{2}}\] on a charcoal piece [MNR 1987]
A)\[Cu\]
B)\[Mg\]
C)\[Al\]
D)\[Zn\]
Correct Answer:
C
Solution :
\[CoAl{{O}_{2}}\] is formed which is blue. Follow cobalt nitrate-charcoal test.