In the presence of air,washing soda loses 9 m | vedclass

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Question

(A) The process in which a hydrated salt loses its water of crystallization when exposed to the atmosphere is known as $Efflorescence$.$Deliquescence$

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Efflorescence

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(A) The process in which a hydrated salt loses its water of crystallization when exposed to the atmosphere is known as $Efflorescence$.$Deliquescence$ refers to the property of a substance to absorb moisture from the atmosphere and become liquid.$Hydration$ is the addition of water,while $Dehydration$ is the removal of water,but the specific term for the loss of water of crystallization to air is $Efflorescence$.

List-$I$ (Alkali Metal)	List-$II$ (Emission Wavelength in $nm$)
$A$. $Li$	$I$. $589.2$
$B$. $Na$	$II$. $455.5$
$C$. $Rb$	$III$. $670.8$
$D$. $Cs$	$IV$. $780.0$

Compound	Uses
$1$. Soda ash	$a$. In purification of sugar
$2$. Calcium oxide	$b$. As an antacid
$3$. Baking soda	$c$. In paper and textile industries
	$d$. To prepare pure fats and oils

In the presence of air,washing soda loses $9$ molecules of water to form a monohydrate: $Na_2CO_3 \cdot 10H_2O \xrightarrow{\text{In open air}} Na_2CO_3 \cdot H_2O + 9H_2O$. This process is known as:

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Match List-$I$ with List-$II$.

List-$I$ (Alkali Metal) List-$II$ (Emission Wavelength in $nm$)

$A$. $Li$ $I$. $589.2$

$B$. $Na$ $II$. $455.5$

$C$. $Rb$ $III$. $670.8$

$D$. $Cs$ $IV$. $780.0$

Choose the correct answer from the options given below:

The metallic lustre exhibited by sodium is explained by

Match the following:

Compound Uses

$1$. Soda ash $a$. In purification of sugar

$2$. Calcium oxide $b$. As an antacid

$3$. Baking soda $c$. In paper and textile industries

$d$. To prepare pure fats and oils

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