Ex2 punctele:a,b,f,h,j
![Ex2 Puncteleabfhj class=](https://ro-static.z-dn.net/files/d89/389879e7ac0d09cd3d22b992701799b0.jpg)
cred ,insa, ca uttima reactie nu are loc cu O2, ci cu [O] in mediu acid !!!