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Question

The equilibrium 2 C u to the power of I end exponent rightwards harpoon over leftwards harpoon C u to the power of 0 end exponent plus C u to the power of I I end exponentin aqueous medium at 25°C shifts towards the left in the presence of :

  1. N O subscript 3 end subscript superscript minus end superscript    
  2. C l to the power of minus end exponent    
  3. SCN    
  4. CN    

The correct answer is: C l to the power of minus end exponent


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