(a) Suggest products for the reaction of Li₃N with water. Write a balanced equation for the reaction.

(b) A compound A was isolated from the reaction between a group 1 metal M and O₂. A reacts with water to give only MOH, while M reacts in a controlled manner with water giving MOH and another product, B. Suggest identities for M, A and B. Write equations for the reactions described. Compare the reaction of M with O₂ with those of the other group 1 metals with O₂.