Verified Solution • 2025–26 Session moderate

QJEEM12Chc77c: JEE Main 2012 Chemistry - Class 11 JEEM12Chc77c Solution: The pH of a 0.1 molar solution of the acid HQ is 3. The value…

The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionization constant, Ka of this acid is :

Multiple Choice Options

  • A 3 ×\times 10–1
  • B 1 ×\times 10–3
  • C 1 ×\times 10–5
  • D 1 ×\times 10–7

Step-by-Step Verified Solution

H+=Cα;α=[H+]C{H^ + } = C\alpha ;\alpha = {{\left[ {{H^ + }} \right]} \over C}

or    α=10−30.1=10−2\,\,\,\alpha = {{{{10}^{ - 3}}} \over {0.1}} = {10^{ - 2}}

Ka=Cα2=0.1×10−2×10−2Ka = C{\alpha ^2} = 0.1 \times {10^{ - 2}} \times {10^{ - 2}}

=10−5= {10^{ - 5}}

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