Reptiles arose during the Carboniferous period. Therefore making the answer Reptiles
Answer:
nitrogen
Explanation:
as the group number increases, the atomic radius decreases
Yes, it has many natural acids. However, the biggest and most prominent acid is the organic acid, malic acid.
Answer: Rate of decomposition of acetaldehyde in a solution is 
Explanation:
Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.
For a reaction : 
![Rate=k[A]^x](https://tex.z-dn.net/?f=Rate%3Dk%5BA%5D%5Ex)
k= rate constant
x = order of the reaction = 2


Thus rate of decomposition of acetaldehyde in a solution is
Answer:
The elements in group 13 and group 15 form a cation with a -3 charge each.