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.

(iv) The chemical formula of product Z is ______.

M g C O_{3}

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N a_{2} C O_{3}

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C a C O_{3}

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N a H C O_{3}

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Solution

The correct option is C $C a C O_{3}$
Calcium oxide on reacting with water forms calcium hydroxide (Y) according to the given reaction:
$CaO(s) + H_{2} O(l) \to {Ca(OH)}_{2} (aq) + H e a t$

A solution of calcium hydroxide(Y) produced in the above reaction is used for whitewashing walls. It reacts slowly with the carbon dioxide in air to form a shiny layer of calcium carbonate(Z) on the walls.
The chemical equation for reaction of calcium hydroxide with carbon dioxide can be written as:
${Ca(OH)}_{2} (aq) + {CO}_{2} (g) \to {CaCO}_{3} (s) + H_{2} O (l)$

Hence, chemical formula of product Z is ${CaCO}_{3}$

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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:

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