How is slaked lime prepared? What are its properties and uses?

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 Multiple Choice QuestionsLong Answer Type

181.

Describe briefly the preparation and uses of magnesium chloride (MgCl2.6H2O).

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182.

How is slaked lime prepared? What are its properties and uses?


Slaked lime is prepared by the following methods:

(i) From quick lime: By treating quicklime with water, slaked lime is formed. 
    
When water is added to quicklime, a huge amount of heat is produced along with the hissing sound. 

(ii) From calcium chloride: By treating calcium chloride with caustic soda, slaked lime is formed.

Properties:
(i) Slaked lime is a white amorphous powder.

(ii) A suspension of slaked lime in water is called milk of lime.

(iii) The aqueous layer which is decanted from the precipitated calcium hydroxide is called lime water.

(iv) On passing carbon dioxide through lime water, the lime water turns milky due  to the formation of insoluble calcium carbonate. 


If carbon dioxide is passed in excess, a clear solution is again obtained. This is because the insoluble calcium carbonate changes into soluble calcium bicarbonate.



If the clear solution is heated, it again turns milky due to the decomposition of calcium bicarbonate into calcium carbonate. 



(v) Slaked lime reacts with chlorine to form bleaching powder.
 

Uses. It is used:

(i) for the preparation of ammonia
(ii) for white washing
(iii) in the purification of sugar
(iv) in the softening of hard water.

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183.

What is lime stone? How is it prepared? Give its properties and uses. 

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 Multiple Choice QuestionsShort Answer Type

184.

How is quick lime prepared on a commercial scale? How is it converted into slaked lime?

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185.

How will you distinguish between:
(i) Slaked lime    (ii) Milk of lime      (iii) Lime water?

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 Multiple Choice QuestionsLong Answer Type

186.

What is Gypsum? How is it prepared? What are its properties and uses?

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187.

What is Plaster of Paris? How is it prepared? What are its properties and uses?

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188.

What is the effect of heat on the following compounds? (Write equations for the reactions):
(i) Calcium Carbonate
(ii) Magnesium chloride hexahydrate
(iii) Gypsum
(iv) Magnesium sulphate heptahydrate

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 Multiple Choice QuestionsShort Answer Type

189.

Give one method of preparing quick lime. What happens when rain water falls on it?

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190.

Name a few important uses of quick lime. 

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