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The s-Block Elements

Long 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?

363 Views

183.

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

114 Views

Short Answer Type

184.

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

146 Views

185.

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

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Long 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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Short Answer Type

189.
Give one method of preparing quick lime. What happens when rain water falls on it?

Calcium oxide is called quicklime. It is prepared by heating the lime stone in a rotatory kiln at 1070-1270 K.

CO₂ formed escapes and hence the above equilibrium shifts towards the formation of calcium oxide.
When rain-water falls on quick lime, slaked lime is formed.