Why type of bond is formed between `H^+ ion` and `NH_3` in the formation of `NH_4^+` ion?

Give the answer of the following preparation of NH_3

One of the catalysts used in the production of NH_3 is

Draw the electron dot picture of NH_4^+ ion.

For the reaction 4NH_3 + 5O_2 rarr 4NO + 6H_2O , the rate of formation of NO is 3.6xx10^-3 mol L^-1s^-1 . Calculate the rate of disappearance of NH_3 and the rate of formation of H_2O .