Which test tube produced the highest effervescent?
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the test tube in which acid react with metal carbonate . for e.g. reaction between HCl and calcium carbonate to give calcium chloride and carbon dioxide and water . calcium chloride is black in colour . Hope it helps you
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A test tube with few drops of ethanoic acid added to solid sodium carbonate.
In the reaction:
2CH3COOH+Na2CO3----> 2CH3COONa+ H2O +CO2
Due to 2CH3COONa AND CO2 brisk effervescence occurs
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