Answer:
in an ancient
Explanation:
when the word begins with a vowel you say an instead of a
CO2 is Carbon Dioxide and PU is Plutonium
Answer:
when CO2 gas is passed through lime water it turns milky due to the formation of calcium carbonate which formula is CaCO3.
Ca(OH)2+ CO2------ CaCO3
when excess of carbon dioxide is passed through calcium carbonate calcium hydrogen carbonate is formed and solution become colourless.
CaCO3+CO2------ Ca(HCO3)
I have posted the answetr in this picture.