1.

The correct decreasing order of basic strength of the following species is: H_(2) O, NH_3 , OH^(-) ,NH_(2)^(-)

Answer»

`NH_(2)^(-)gt OH^(-) gt NH_3gtH_2 O`
`OH^(-)gt NH_(2)^(-)gt H_2 OGT NH_3`
`NH_(3) gt H_2 Ogt NH_(2)^(-)gt OH^(-)`
`H_(2) O gtNH_(3) gt OH^(-) gt NH_(2)^(-)`

SOLUTION :`H_2 O` is a stronger acid than `NH_3` or `NH_3`is more basic than WATER. Conjugate base of weaker acid `NH_3`, i.e., `NH_(2)^(-)`is a stronger basethan the conjugate base of stronger acid `(H_2 O)` i.e, `OH^(-)`.
Hence, the order of basic STRENGTH is `NH_(2)^(-)gtOH^(-)gtNH_3gtH_2 O`


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