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The dissociations constant (Kb) " for ...

The dissociations constant ` (K_b) " for " NH_3 ,CH_3NH_2, (CH_2)_2 NH and (CH_3)_3 N " are " 0.2 xx 10^(-4) ,4.2 xx 10 ^(-4) , 6 .0 xx 10 ^(-4) and 0.6 xx 10 ^(-4)` respectively . Which one is the strongest base and why?

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` (CH_3) _2NH`
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ICSE-EQUILIBRIUM -SHORT ANSWER TYPE QUESTIONS
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