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प्रश्न
Assertion (A): Reaction of Quicklime with water is an exothermic reaction.
Reason (R): Quicklime reacts vigorously with water releasing a large amount of heat.
विकल्प
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true, but (R) is false.
(A) is false, but (R) is true.
उत्तर
Both (A) and (R) are true and (R) is the correct explanation of (A).
Explanation:
Slaked lime is produced with the evolution of a great deal of heat when quicklime (calcium oxide) is treated with water. This reaction is therefore exothermic in nature.
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संबंधित प्रश्न
Name the substance obtained by the action of chlorine on solid (dry) slaked lime.
State two uses each of the following compounds:
Chlorine
What is bleaching powder?
How is bleaching powder prepared? Write chemical equation of the reaction involved in the preparation of bleaching powder.
What happens when bleaching powder reacts with dilute sulphuric acid? Give equation of the reaction involved.
State two important uses of bleaching powder.
Which of the following is treated with chlorine to obtain bleaching powder?
(a) CaSO4
(b) Ca(OH)2
(c) Mg(OH)2
(d) KOH
A white powdery substance having strong smell of chlorine is used for disinfecting drinking water supply at waterworks. Identify the substance. Give its chemical name and write the chemical reaction for its preparation.
Give a scientific explanation.
Bleaching powder has the odour of chlorine.
Write the chemical formula.
Bleaching powder
