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Chemistry Test 82
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Chemistry Test 82
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  • Question 1/6
    4 / -1

    A certain weak acid has a dissociation constant of 10–4. The equilibrium constant for its reaction with a strong base is :-

    Solutions

    Keq = ka/kw = 1010

     

  • Question 2/6
    4 / -1

    Which of the following pairs constitutes buffer solution?

    Solutions

    A weak acid and its salt with strong base constitutes buffer.

     

  • Question 3/6
    4 / -1

    It is found that at 25°C 0.1 M solution of four sodium salts NaA, NaB, NaC and NaD have the pH values 7, 9, 10, 11 respectively. Which one of the corresponding acids is strongest?

    Solutions

    Aqueous solution of a salt which is obtained from strong acid and strong base is neutral. Hence HA is strong acid in among other acids.

     

  • Question 4/6
    4 / -1

    On adding 0.1 M solution each of Ag+, Ba+2, Ca+2  ions in a Na2SO4 solution, species first precipited is (Ksp for BaSO4 = 10–11, Ksp for CaCO3 = 10–6,Ksp for Ag2SO4 = 10–5).

    Solutions

    Compound with lowest Ksp value, will precipitate first.

     

  • Question 5/6
    4 / -1

    If pKb of a base is 5, then Ka of its conjugate acid will be

    Solutions

    pka + pkb= 14 (for conjugate pairs)

    pka = 14–pkb = 14 – 5 = 9

    ka = 10–pka = 10–9

     

  • Question 6/6
    4 / -1

    Which of the following is the correct quadratic form of Ostwald's dilution law equation for AB type electrolyte :

    Solutions

    According to Ostwald's dilution law,

    K = Cα2 / 1 - α

    or K – Kα = Cα2 or Cα2 + Kα – K = 0

    or α2C + αK – K = 0

     

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