Q. 74.5( 8 Votes )
A student dropped few pieces of marble in dilute HCl contained in a test tube. The evolved gas was passed through lime water.
(a) What change would be observed in lime water?
(b) Write balanced chemical equation for the above change.
a. Marble is chemically composed of calcium carbonate (CaCO3). According to the question, the student dropped few pieces of marble in dilute HCl contained in a test tube. We know that acids react with calcium carbonate to form or give the corresponding salt, carbon dioxide and water. Hence, when we pass the carbon dioxide gas through lime water a white precipitate would be observed to form in the test tube containing the lime water.
b. The balanced chemical equation for the above change when we pass the carbon dioxide gas through lime water is : -
Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
Rate this question :
Two carbon compounds X and Y have the molecular formula C4H8 and C5H12 respectively. Which one of these is most likely to show addition reaction? Justify your answer. Also, give the chemical equation to explain the process of addition reaction in this case.
Complete the following chemical equations:
i. CH3COOC2H5 + NaOH →
ii. CH3COOH + NaOH →
iii. C2H5OH+CH3COOHXam idea - Science
(a) What are X, Y and Z?
(b) Write equations for the reactions which take place:
(i) when limestone reacts with dilute HCl
(ii) when gas X reacts with lime water to form white precipitate Y
(iii) when excess of gas X dissolves white precipitate Y to form a soluble compound ZLakhmir Singh & Manjit Kaur - Chemistry