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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?

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183.

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

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Short Answer Type

184.
How is quick lime prepared on a commercial scale? How is it converted into slaked lime?

Commercial preparation: Quicklime is anhydrous calcium oxide (CaO) and is formed by heating limestone (CaCO₃) in a specially designed kiln.

Formation of slaked lime: Slaked lime is formed when quicklime is added to water. The reaction is highly exothermic in nature and called slaking of 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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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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