Practice Test 9
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  • Solution

    Reaction (c) can be obtained by adding reactions (a)and (b) therefore K3= K1. K2
    Hence (c) is the correct answer.

A weak acid, HA, has a Ka of 1.0 × 10–5. If 0.1 mole of this acid dissolved in one litre of water, the percentage of acid dissociated at equilbrium is closest to

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Which of the following is conjugate base of [C2H5NH3]+

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A buffer solution is prepared by mixing 0.1 M ammonia and 1.0 M ammonium chloride. At 298 K, the pKb of NH4OH is 5.0. The pH of the buffer is

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Solubility of BaF2 in a solution of Ba(NO3)2 will be represented by

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    Ba++ is common ion in the both solution. The solubility will depend on more reactive element.Option (c) is correct

When equal volumes of the following solutions are mixed,precipitation of AgCl (Ksp= 3 × 10-10) will occur with –

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If the equilibrium constant of the reaction of weak acid HA with strong base is 107, then pOH of the aqueous solution of 0.1M NaA is –

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The buffering action of an acidic buffer is maximum when its pH is equal

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    Buffering action is maximum when[Salt] = [Acid]i.e., pH = pKa

In qualitative analysis, in III group NH4Cl is added before NH4OH because

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    Due to common ion effect addition of NH4Cl in group(III) suppresses the ionisation of NH4OH with the result concentration of OH- decreases.

Amongst the following hydroxides, the one which has the lowest value of Ksp at ordinary temperature (about 25ºC) is :

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    In case of alkaline earth hydroxides solubility increases on moving down the group.Be(OH)2 has lowest solubility and hence lowest Ksp/sub>.

The solubility of CaF2 in pure water is 2.3×10-4 mol dm-3.Its solubility product will be :

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