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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? - CBSE Class 10 - Science

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Question

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?

Solution

(a) Solid X is calcium oxide, commonly known as quicklime. Its chemical formula is CaO.

(b) Product Y is calcium hydroxide, commonly known as slaked lime. Its chemical formula is Ca(OH)2.

(c) Common name of the solution of Y is "lime water", which is used to test carbon dioxide gas.

(d) CaO (s) + H2(l)→ Ca(OH)2 (aq) + HEAT

(e) This chemical reaction is characterised by change in temperature because a huge amount of heat is evolved in this reaction, causing rise in temperature of the mixture.

  Is there an error in this question or solution?

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 Lakhmir Singh Solution for Chemistry for Class 10 (2019 Exam) (2018 to Current)
Chapter 1: Chemical Reactions and Equations
Q: 47 | Page no. 22
Solution 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? Concept: Chemical Equation.
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