Why is anhydrous CaSO4 used as a drying agent? Why not Plaster

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The s-Block Elements

Short Answer Type

71.

Explain why an aqueous solution of beryllium chloride is acidic.

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72.

Which salt is used for the preparation of Green fire?

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73.

What is 'Fluid Magnesia'?

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74.

Halides of Be dissolve in organic solvents while those of Ba do not. Why is it so?

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75.

What is dead burnt plaster?

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76.
Why is anhydrous CaSO₄ used as a drying agent? Why not Plaster of Paris?

Anhydrous CaSO₄ can absorb water to form CaSO₄.2H₂O and hence can be used as drying agent. Plaster of Paris is not used as a drying agent because it sets into a hard mass by absorbing water.

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77.

What is line mortar?

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78.

Which metal is extracted by Dow's process?

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79.

Name a substance which is used in making chalks.

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80.

Why anhydrous magnesium chloride is not obtained by simply heating hexahydrate?

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