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The dissociation constant of two weak acids are K a 1 and K a 2 respectively. Their relative strength of identical concentration is-

Options

  1. AK a 2 K a 1
  2. B( K a 1 K a 2 ) 1 2
  3. CK a 1 K a 2
  4. D( K a 1 × K a 2 K a 1 ) 1 2

Correct answer

B. ( K a 1 K a 2 ) 1 2

Step-by-step solution

Applying Ostwald's dilution law, α 1 = K a 1 c and α 2 = K a 2 c Thus, Relative strength = ( s t r e n g t h o f a c i d I ) ( s t r e n g t h o f a c i d I I ) = α 1 α 2 = ( K a 1 K a 2 )

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