Solutions P and Q each contain a different Group 2 ion at the same concentration. One contains Mg²⁺ and the other contains Ba²⁺. Tests are carried out on separate 5 cm³ samples of P and Q. test 1: add 1 cm³ of 0.1 mol dm⁻³ Na₂SO₄(aq) test 2: add 1 cm³ of 0.1 mol dm⁻³ NaOH(aq) What are the results of these tests?

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Which statement relating to the elements in Group 17 and their compounds is correct?

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