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प्रश्न
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?
उत्तर
(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) + H2O (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.
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संबंधित प्रश्न
State whether the following statement is true or false:
A chemical equation can be balanced easily by altering the formula of a reactant or product.
Balance the following equation and add state symbols:
Zn + HCI → ZnCI2 + H2
One of the following is an exothermic reaction. This is:
(a) electrolysis of water
(b) conversion of limestone into quicklime
(c) process of respiration
(d) process of photosynthesis
Write word equation for the following skeletal equation:
\[\ce{KClO3 -> KCl + O2}\]
Balance the equation stepwise.
NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + H2O(l)
Write the balanced chemical equation of the following reaction. iron + sulphuric acid → ferrous sulphate + hydrogen.
Write the balanced chemical equation of the following reaction.
aluminium carbide + water → aluminium hydroxide + methane
What is thermit process? Where is this process used? Write a balanced chemical equation for the reaction involved.
\[\ce{2KClO3->[MnO2] 2KCl + 3O2[g] - is a balanced equation.}\]
State why the compound MnO2 is written above the arrow.
Balance the following simple equation:
Al + H2O → Al2O3 + H2
