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At 25°C, the dissociation constant of a base, BOH is 1.0 x 10-12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be                                     

(a) 2.0 x 10-6 mol L-1              (b) 1.0 x 10-5 mol L-1 

(c) 1.0 x10-6 mol  L-1              ( d) 1.0 x10-7 mol L-1