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Reactivity with Dihydrogen (Group 1)

Why is anhydr...

Question

Why is anhydrous $C a C l_{2}$ used in a desiccator? Name one substance that is 'efflorescent'.

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Solution

Anhydrous $C a C l_{2}$ is deliquescent, absorbs moisture, and is hence used in a desiccator for drying other substances.

Washing soda $(N a_{2} C O_{3} . 10 H_{2} O)$ is an example of an efflorescent substance.

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Similar questions

Q. Why is anhydrous $C a C l_{2}$ used in a desiccator? Name one substance that is 'efflorescent'.

Q. Answer the following question relating your answers only -to salts in the list given below:

{C a C l}_{2}, {C u S O}_{4} .5 H_{2} {O, N a}_{2} {C O}_{3} . {10 H}_{2} O

Which compound is efflorescent?

Q. Match the following:

Set 1	Set 2
a)Deliquescent substance	(i)Washing soda
b)Efflorescent substance	(ii)Conc. sulphuric acid
c) Desiccants	(iii)Sodium hydroxide

Q. Anhydrous calcium chloride is often used as a desiccant. In the presence of excess of

C a C l_{2}

, the amount of the water taken up is governed by

K_{P} = 6.4 \times 10^{85}

for the following reaction at room temperature,

C a C l_{2} (s) + 6 H_{2} O (g) ⇌ C a C l_{2} . 6 H_{2} O (s) .

What is the equilibrium vapour pressure of water in a closed vessel that contains

C a C l_{2} (s) ?

State whether following statement is True or False:

C a C l_{2}

H_{2} S O_{4}

is used in a desiccator.

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