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Q.

The rate constant at 250C for the reaction of NH4+ and OH- to form NH4OH is 4 × 1010 M-1 sec-1 and ionization constant of aq. NH3 is 1.8 × 10-5. The rate constant of proton transfer to NH3 is

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a

1.8 × 10-5

b

7.2 × 105

c

3.6 × 105

d

4.2 × 10-5

answer is B.

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Detailed Solution

NH4+ + OH-→K1 NH4OH;               k1 = 4 × 1010 NH4OH ⇌KbKf  NH4+ + OH- keq =KfKb1.8× 10-5 = kf4× 1010 ⇒ kf = 7.2× 105
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