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The table below shows the tests carried out on a sample of water and the results obtained.

(a) Identify the anion present in the water.
(b) Write an ionic equation for the reaction in III.
(c) Write the formula of the complex ion formed in II.

Answer Text:
a)Sulphate ion
b) #Ba^(2+)(aq) +SO^(2-) to BaSO_4(s)#
c) #Zn(NH_3)_4^(2+)#