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, The evolved gas turns lime water milky due to the formation of-
(1) \( \mathrm{MgCO}_{3} \)
(2) \( \mathrm{CaCO}_{3} \)
(3) \( \mathrm{Na}_{2} \mathrm{CO}_{3} \)
(4) \( \mathrm{K}_{2} \mathrm{CO}_{3} \)
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