Which of the following statements is/are correct? (a) A filter paper moistened with cadmium acet...

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Which of the following statements is/are correct?
(a) A filter paper moistened with cadmium acetate solution turns yellow, when brought in contact with \( \mathrm{H}_{2} \mathrm{~S} \) gas.
(b) Both carbonate ions as well as bicarbonate ions in the solutions, give reddish-brown precipitate with mercury(II) chloride.
(c) Sulphites in presence of zinc, reacts with dilute \( \mathrm{H}_{2} \mathrm{SO}_{4} \) to liberate \( \mathrm{SO}_{3} \) gas.
(d) A filter paper moistened with \( \mathrm{KIO}_{3} \) and starch turns blue in contact with \( \mathrm{SO}_{2} \) vapours.
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