In the reversible reaction in water solution nh3 + h2o ⇀↽ nh+ 4 + oh− , what acts as a bronsted-lowry acid and what acts as a bronsted-lowry base? 1. oh−; h2o 2. h2o; oh− 3. h2o; nh+ 4 4. oh−; nh+ 4 5. nh3; h2o

The equation is:
NH₃     + H₂O     ↔    NH₄⁺          +       OH⁻
base       acid            conj. acid        conj. base

NH₃ is the proton acceptor so it considered as Bronsted-Lowry base and H₂O is proton donor so it considered as Bronsted-Lowry acid 

NH₃ when accepted H⁺ it converted into NH₄⁺ (conjugate acid) and H₂O when losing H⁺ it converted into OH⁻ (conjugate base)

The question asks for acid and base 
1) OH⁻ base, H₂O acid
2) H₂O acid, OH⁻ base
3) H₂O acid , NH₄⁺ acid
4) OH⁻ base, NH₄⁺ acid
5) NH₃ base, H₂O acid

so the correct answer is 2) because it is the only one containing acid then base

The main types of electromagnetic radiation. radio  waves have  the lowest frequencies  and  longest  wavelengths, while gamma  waves have highest frequencies  and shortest wavelengths. the wavelengths vary across the electromagnetic spectrum from about 10–15 m to more than 104 m.hope it !