On adding a white solid ‘X’ to water, a hissing sound is heard and a lot of heat is produced along with the formation a product ‘Y’.
The solution of ‘Y’ is applied on the walls of buildings during whitewashing. It reacts with carbon dioxide in air to form 'Z'. This Z gives a shiny finishing to the walls after 2-3 days of whitewashing.

(ii) The chemical formula of the product Y is _______.

Ca(OH)₂

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

CaCO₃

No worries! We‘ve got your back. Try BYJU‘S free classes today!

CaSO₄.1/2 H₂O

No worries! We‘ve got your back. Try BYJU‘S free classes today!

CaSO₄. 2H₂O

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A Ca(OH)₂
The white solid 'X' is calcium oxide with chemical formula CaO and is commonly known as quicklime. Calcium oxide reacts with water to form calcium hydroxide(slaked lime) and a lot of heat is also released. The reaction can be represented as:
CaO(s) + H₂O(l) → Ca(OH)₂(aq) + Heat
The product 'Y' is calcium hydroxide, Ca(OH)₂.

Suggest Corrections

Similar questions

Q. On adding a white solid ‘X’ to water, a hissing sound is heard and a lot of heat is produced along with the formation a product ‘Y’.
The solution of ‘Y’ is applied on the walls of buildings during whitewashing. It reacts with carbon dioxide in air to form 'Z'. This Z gives a shiny finishing to the walls after 2-3 days of whitewashing.

(i) The chemical formula of solid ‘X’ is _______.

Q. On adding a white solid ‘X’ to water, a hissing sound is heard and a lot of heat is produced along with the formation a product ‘Y’.
The solution of ‘Y’ is applied on the walls of buildings during whitewashing. It reacts with carbon dioxide in air to form 'Z'. This Z gives a shiny finishing to the walls after 2-3 days of whitewashing.

(iii) Formation of Y in this case is an example of _________ reaction.

Q. When water is added gradually to a white solid X, a hissing sound is heard and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during white washing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory.
(a) What could be solid X? Write its chemical formula.
(b) What could be product Y? Write its chemical formula.
(c) What is the common name of the solution of Y which is used for testing carbon dioxide gas?
(d) Write chemical equation of the reaction which takes place on adding water to slid X.
(e) Which characteristic of chemical reactions is illustrated by this example?

Q. Why whitewashing walls gives a shiny finish to the walls?

We use a solution of slaked lime to whitewash the walls. In the beginning the wall looks rough and coarse, but after 2 - 3 days the wall appears smooth and shiny. This is due to the formation of:

Join BYJU'S Learning Program