A brisk effervesce occurs, when nitric acid is added to egg shell. This is because egg shell comprises__?

A brisk effervesce occurs, when nitric acid is added to egg shell. This is because egg shell comprises__?

[A] Sodium Carbonate
[B] Calcium Carbonate
[C] Calcium Hydroxide
[D] Magnesium Sulphate

Correct Answer: B [Calcium Carbonate]