If there is effervescence with the evolution of a \( \mathrm{P} \) ...

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If there is effervescence with the evolution of a
\( \mathrm{P} \)
colourless and odourless gas on adding dil. \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
W
to the solid salt, this indicates the presence of-
(1) Sulphate ion
(2) Sulphide ion
(3) Carbonate ion
(4) Nitrate ion
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