Question

A compound 'E' when heated forms compounds
F’and 'G'
*F' is an acidic gas which when passed through lime water, it turns lime water milk
When water is added to compound G, a lot of heat energy is evolved with the
formation of a metallic hydroxide. Compound G is also known as quicklime.
On basis of above information, answer the following questions
(i) Identify compounds E, F.
(ii) Write a balanced chemical equation for the above reaction.
(iii) State the type of reaction involved in question (ii).
(iv) What will happen when excess of compound F is passed through lime water
Give a valid reason for question (iv).​

Answer 1

Answer:

(1)Compound E is calcium carbonate (Caco3)

Gas F is carbon dioxide (Co2)

(2) Caco3 - - (heated) - - > CaO (calcium oxide) + Co2

(3) The type of reaction is thermal decomposition reaction.

(4) Carbon dioxide reacts with limewater (a solution of calcium hydroxide, Ca(OH) 2), to form a white precipitate (appears milky) of calcium carbonate, CaCO 3. Adding excess carbon dioxide results in the precipitate dissolving to form a colourless solution of calcium hydrogencarbonate.

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