NEETChemistryCoordination Compounds
Match the reactions given in List I with the characteristic appearance of their products in List II. List I List II A. Cu ²⁺( aq ) + excess NH ₃( aq ) 1. Blood red solution B. Fe ³⁺( aq ) + SCN ⁻( aq ) 2. Rosy red precipitate C. Ni ²⁺( aq ) + DMG (in basic medium) 3. Deep blue solution D. AgCl ( s ) + aqueous NH ₃ 4. Colourless solution Choose the correct answer from the options given below:
Options
- AA-2, B-1, C-3, D-4
- BA-3, B-2, C-1, D-4
- CA-4, B-1, C-2, D-3
- DA-3, B-1, C-2, D-4
Correct answer
D. A-3, B-1, C-2, D-4
Step-by-step solution
A. Cu ²⁺ reacts with excess aqueous ammonia to form the tetraamminecopper(II) complex, [ Cu ( NH ₃)₄]²⁺ , which is a deep blue solution. (A-3) B. Fe ³⁺ reacts with thiocyanate ions ( SCN ⁻ ) to form the [ Fe ( SCN )]²⁺ complex, which gives a blood red colouration. (B-1) C. Ni ²⁺ reacts with dimethylglyoxime (DMG) in a basic medium to form a rosy red (or cherry red) precipitate of bis(dimethylglyoximato)nickel(II). (C-2) D. AgCl dissolves in aqueous ammonia to form the diamminesilver(I) complex, [ Ag ( NH ₃)₂]⁺ , wh