Two salts 'X' and 'Y' are dissolved in water ...

CBSE Class 10 Science 2023 All Sets Solutions

Question : 10 of 20

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Two salts 'X' and 'Y' are dissolved in water separately. When phenolphthalein is added to these two solutions, the solution 'X' turns pink and the solution 'Y' does not show any change in colour, therefore 'X' and 'Y' are

(X) (Y)
$Na_2CO_3$ $NH_4Cl$
(X) (Y)
$Na_2SO_4$ $Na_2HCO_3$
(X) (Y)
$NH_4Cl$ $Na_2SO_4$
(X) (Y)
$NaNO_3$ $Na_2SO_4$

Solution:

Salt X is

Na_2CO_3

(sodium carbonate) and salt Y is

NH_4Cl

. The reason for this is that

Na_2CO_3

is a basic salt, and when it is dissolved in water, it dissociates to produce hydroxide ions

(OH^-)

When

NH_4Cl

dissolve in water it forms acidic solution and the colour of phenolphthalein in acidic medium is colour less.

Hence X =

Na_2CO_3

and Y =

NH_4Cl

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(X)	(Y)
$Na_2CO_3$	$NH_4Cl$

(X)	(Y)
$Na_2SO_4$	$Na_2HCO_3$

(X)	(Y)
$NH_4Cl$	$Na_2SO_4$

(X)	(Y)
$NaNO_3$	$Na_2SO_4$