A. SO4 2− ions
B. SO3 2− ions
C. NO3− ions
D. SO3 2− ions
Correct Answer:
Option D – SO3 2− ions
Explanation
Effervescence is the formation of gas bubbles in a liquid by a chemical reaction. An example of effervescence is the release of carbon dioxide which bubbles as a gas from the liquid when limestone chips, which are composed of calcium carbonate, are added to dilute hydrochloric acid.
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