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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