If these answers are not the one, don't go off on me because I'm trying my best :
1. A
2. A
3. C
The believe that the best answer among the choices provided by the question is O with a pair of electrons above and below, a double-bond to the N with a pair of electrons above, a double-bond to the O with two pairs of electrons around it.
Hope my answer would be a great help for you. If you have more questions feel free to ask here at Brainly.
Answer:
when the degree is less than 90
Explanation:
In normal atmosphere, analytical reagents may absorb water molecules that may affect the results of chemical reactions. So, in order to get accurate results from these analytical regents, they must be stored in a dessicated atmosphere or heated before being used so that the water molecules must dry away.