1.

Zn+2H^(+)toZn^(2+)+H_(2) Half-life period is independent of concentration of zinc at constant pH. For the constant concentraio of Zn, rate becomes 100 times when pH is decreased from 3 "to" 2. Hence,

Answer»

`(dx)/(DT)=k[XN]^(0)[H^(+)]^(2)`
`((dx)/(dt))=k[Zn][H^(+)]^(2)`
rate is not affected if connentration of zinc is made fourn TIMES and that of `H^(+)` ion is halved
rate becomes FOUR times if concentration of `H^(+)` ions is doubled at CONSTANT Zn concentration.

Answer :B::C::D


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