Chemical Kinetics and Nuclear ChemistryHard

Question

Zn + 2 H+ → Zn2+ + H2
Half-life period is independent of concentration of zinc at constant pH. For the constant concentration of Zn, rate becomes 100 times when pH is decreased from 3 to 2. Hence ,

Options

A.= k [Zn]0[H+]2
B.= k [Zn][H+]2
C.rate is not affected if concentration of zinc is made four times and that of H+ ion is halved
D.rate becomes four times if concentration of H+ ion is doubled at constant Zn concentration

Solution

(B) Half life period independent of conc. of Zn than order W.R.T. Zn is 1st
Rate = k [Zn][H+]n    we can write
by data
   
Given n = 2
Then Rate = k [Zn][H+]2
(C) Conc. of Zn four times and H+ ion is halved
Rate = k[4 × Zn]
Rate = k [Zn][H+]2
Rate remians and same.
(D) Similarly if conc. of H+ doubled and [Zn] constant
Then    Rate2  = k [Zn] [2H+]2
Rate2 = 4 k [Zn] [H+]2
Rate2 =  4 x Rate1

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