JEE Main 2026 Chemistry question
A first row transition metal (M) does not liberate gas from dilute HCl. 1 mol of aqueous solution of is treated with excess of aqueous KCN and then is passed through the solution. The amount of MS (metal sulphide) formed from the above reaction is mol.
Answer: (4)
Solution
M is Cu; with excess KCN forms a stable complex , which does not give sulphide precipitate with .