Practice Test 5
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The value of the ionic product of water

  • Solution

    The value of ionic product of water changes with the temperature.

Among BMe3, BCl3, BF3 and B2H6, which one will be the best Lewis acid ?

  • Solution

    In BCl3 and BF3 due to –I effect of F and Cl these are better Lewis acids than BMe3 and B2H6. Among BCl3 and BF3, the former is better Lewis acid as in it p?-p? back bonding is lesser than in BF3.

100 mL of 0.04 N HCl aqueous solution is mixed with 100 mL of 0.02 N NaOH solution. The pH of the resulting solution is:

  • Solution

pH of 0.1 M NH3 aqueous solution is : (Kb = 1.8 × 10-5)

  • Solution

Which of the following has highest pH ?

  • Solution

    Among M/4 KOH, M/4 NaOH, M/4 NH4OH and M/4 Ca(OH)2,Ca(OH)2 furnishes highest number of OH- ions
    (∵ Ca(OH)2 ⟶ Ca2+ + 2OH-). So pH of M/4Ca(OH)2 is highest.

The pH of 0.005 molar solution of H2SO4 is approximately:

  • Solution

The pH of 0.1 M solution of the following salts increases in the order

  • Solution

The pH value for 1/1000 N-KOH solution is :

  • Solution

    In N/1000 KOH, [OH-] = 10-3 M
    pOH = – log [OH-] = – log 10-3 = 3
    pH = 14 – pOH = 14 – 3 = 11

The strongest Bronsted base is :

  • Solution

    Strongest Bronsted base has weakest conjugate acid.
    ∵ HOCl is weakest acid among HOCl, HClO2, HClO3 and HClO4.
    ∴ Conjugate base of HOCl (i.e. OCl–) is strongest Bronsted base

The pH of 10–10 M NaOH solution is nearest to:

  • Solution

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