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For the reaction A g ( C N ) 2 - ( a q ) ⇌ A g + ( a q ) + 2 C N - ( a q ) , the K c at 25 ° C is 4 × 1 0 - 19 . Then [ A g + ] in solution which was originally 0.1 M in KCN and 0.03 M in A g N O 3 will be

Options

  1. A2.5 × 1 0 - 18 M
  2. B6.78 × 1 0 - 15 M
  3. C7.5 × 1 0 - 14 M
  4. D7.5 × 1 0 - 18 M

Correct answer

D. 7.5 × 1 0 - 18 M

Step-by-step solution

A g ( C N ) 2 - T = 00 0.03 M ⇌ A g + x M ( v e r y s m a l l ) + 2 C N - 0.1 - 0.03 × 2 K p = Ag + (CN − ) 2 [Ag(CN) 2 ] − x ( 0.04 ) 2 0.03 = 4 × 1 0 - 19 On solving x = 7.5 × 1 0 - 18 M

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