## Question

###### The acid ionization (hydrolysis) constant of $mathrm{Zn}^{2+}$ is $1.0$ $imes 10^{-9} .$ Which of the following statements are correct?(i) the basic dissociation constant of $mathrm{Zn}(mathrm{OH})^{+}$is $1.0 imes 10^{5}$(ii) the $mathrm{pH}$ of $0.001 mathrm{M} mathrm{ZnCl}_{2}$ solution is 6(iii) the basic dissociation constant of $mathrm{Zn}(mathrm{OH})^{+}$is $1.0 imes 10^{-5}$(iv) the $left[mathrm{H}_{3} mathrm{O}^{+}ight]$ion concentration in $0.001 mathrm{M} mathrm{ZnCl}_{2}$solution is

The acid ionization (hydrolysis) constant of $mathrm{Zn}^{2+}$ is $1.0$ $ imes 10^{-9} .$ Which of the following statements are correct? (i) the basic dissociation constant of $mathrm{Zn}(mathrm{OH})^{+}$is $1.0 imes 10^{5}$ (ii) the $mathrm{pH}$ of $0.001 mathrm{M} mathrm{ZnCl}_{2}$ solution is 6 (iii) the basic dissociation constant of $mathrm{Zn}(mathrm{OH})^{+}$is $1.0 imes 10^{-5}$ (iv) the $left[mathrm{H}_{3} mathrm{O}^{+} ight]$ion concentration in $0.001 mathrm{M} mathrm{ZnCl}_{2}$ solution is $1.0 imes 10^{-4}$. (a) 1,2 (b) 2,3 (c) 3,4 (d) $1,2,4$

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