1. ___ SnO2+ __ H2 → ___ Sn + ___ H2O 2 SnO2 + 2 H2 → 2 Sn + H2O
SnO2 + 2 H2-Sn + 2 H2O
SnO2 + Hz-Sn + 2 H2O
2 SnO2 + H22Sn + H2O

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the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l