In which of the following species the inter atomic bond angle is 109^@

1.	In which of the following species the inter atomic bond angle is 109^@ .28?
Answer» `NH_3 (BF_3)` `(NH_4)^+ (BF_3)` `NH_3 (BF_4)^(-)` `(NH_2)^(-) (BF_3)` ANSWER :A

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