(a) A group 2 metal, M, dissolves in liquid NH3, and
from the solution, compound A can be isolated. A slowly decomposes to B with liberation of NH3 and a gas C. Metal M gives a crimson flame test; through blue glass, the flame appears pale purple. Suggest identities for M, A, B and C.
(b) The group 2 metal X occurs naturally in great abundance as the carbonate. Metal X reacts with cold water, forming compound D, which is a strong base. Aqueous solutions of D are used in qualitative tests for CO?. X combines with H2 to give a saline hydride that is used as a drying agent. Identify X and D. Write equations for the reaction of X with H2O and of the hydride of X with H2O. Explain how you would carry oul a qualitative test for CO2 using an aqueous solution of D.
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