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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?

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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?

Gypsum is hydrated calcium sulphate, CaSO₄.2H₂O
Preparation: It can be prepared by the action of dilute sulphuric acid on calcium carbonate or calcium hydroxide.

Properties:
(i) It is a white crystalline solid sparingly soluble in water.
(ii) On heating to 393 K, it changes into

On heating to about 437 K, it changes into anhydrous calcium sulphate.

Uses. It is used:

(i) in the manufacture of cement.
(ii) for manufacturing Plaster of Paris
(iii) as a drying agent.
(iv) for the preparation of ammonia, bleaching powder slaked lime and basic calcium nitrate.

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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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