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 Form 2 Chemistry questions and answers on salts

When solid B1 was heated, a gas which formed a white precipitate when passed through lime water was produced. The residue was dissolved in dilute nitric (V) acid to form a colourless solution #B_2#. When dilute hydrochloric acid was added to solution #B_2# a white precipitate which dissolved on warming was formed.
(a) Write the formula of the;
I. Cation in solid #B_1#
II. Anion in solid #B_1#
(b) Write an ionic equation for the reaction between the residue and dilute nitric (V) acid.

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