Solution of a salt in dilute \( \mathrm{H}_{2} \mathrm{SO}_{4} \) o...

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Solution of a salt in dilute \( \mathrm{H}_{2} \mathrm{SO}_{4} \) or acetic acid produces deep blue colour with starch iodide solution. The salt
\( \mathrm{W} \) contains :
(b) \( \mathrm{I}^{-} \)
(a) \( \mathrm{Br}^{-} \)
(d) \( \mathrm{NO}_{2}^{-} \)
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