Auro, a 10th standard student was asked to identify iron, copper, zinc and aluminium only by observing the effect of action of concentrated nitric acid and caustic soda on each metal. How did he put the eractions of these metals with each of the reagents?

Auro, a 10th standard student was asked to identify iron, copper, zinc

1.	Auro, a 10th standard student was asked to identify iron, copper, zinc and aluminium only by observing the effect of action of concentrated nitric acid and caustic soda on each metal. How did he put the eractions of these metals with each of the reagents?
Answer» Solution :`{:("ACTION concentrated nitric ACID","Action of CAUSTIC alkali","Inference"),("No characteristic change","No characteristic change " , "Iron"),("Liberates brown COLOURED" NO_2 "gas", "No characteristic change","Copper"),("Liberates brown coloured"NO_2 "gas","Liberates hydrogen gas","Zinc"),("No Characteristic change ","Liberates hydrogen gas ","Aluminium ") :}`