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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?

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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

(i) Calcium carbonate on heating decomposes to produce calcium oxide (quick lime) and carbon dioxide.

(ii) MgCl₂.6H₂O, on heating undergoes hydrolysis by its own water of crystallisation to give magnesium oxide and hyrogen chloride.

(iii) On heating to 390K, it forms a compound having the composition

which on heating above 473 K, changes into anhydrous calcium sulphate.

(iv) On heating to 423 K, it changes into monohydrate which on further heating to 473K, forms anhydrous salt.

Anhydrous salt on further heating, forms MgO.

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Short 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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Previous Year Papers

Test Series

Test Yourself

Long Answer Type

Short Answer Type

Long Answer Type

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

Short Answer Type

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