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Dear Student

(i) Aqueous solution of Ammonia gives us NH4+ and OH- as shown below

NH3 + H2O NH4+ + OH-   now since the solution contains OH-  so it is basic in nature ( By definition of Base) Hence it turns red litmus blue. 

(ii) Strong base is one which produce large no of hydroxides ions in the solution but in case of aqueous ammonia , Ammonia donates lone pair of electron to water which leads to only few amount of hydroxide ions ( Partial dissociation) so it is a weak base and now since it doesn't produce enough no of hydroxide ions which indicates partial dissociation so it is termed as weak electrolyte ( As weak electrolyte ionises partly in aqueous solution) .


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