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W is a colourles aqueous solution with the following properties:
I it turns blue litmus paper red.
II On addition of cleansed magnesium ribbon, it gives off a gas that burns with a pop sound. III On addition of powdered sodium carbonate, it gives
off a gas which forms a white precipitate with calcium hydroxide solution. IV When warmed with copper (II) oxide powder, a blue solution is obtained but
no gas given off. V On addition of aqueous barium chloride, a white precipitate is obtained.
(a)(i) state what properties (I) and (III) indicate about the nature of W.
(ii) give the identity of W.
(iii) name the colourless solution formed in (II) and (III).
(iv) Write the ionic equation in (V).