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Question

Alex had two solutions: X and Y. He added a few drops of turmeric water in solution X and observed that the solution X turned yellow in colour. On adding turmeric water to solution Y, he observed that the solution turned red in colour. From the options given below, identify the solutions that match Alex’s observations.

A
X:Na2CO3; Y:NH4Cl
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B
X:NH4Cl; Y:Mg(NO3)2
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C
X: NH4Cl; Y:Na2CO3
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D
X:NaCl; Y:K2SO4
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Solution

The correct option is C X: NH4Cl; Y:Na2CO3
Turmeric water is a visual indicator. In the presence of acids, its colour remains yellow, while in the presence of bases, its colour changes to red.
Now, the given salts can be categorised as acidic, basic, and neutral salts based on the acid and base from which the salt has been made.
Salt Acid Base Nature of salt Colour of turmeric solution
NH4Cl HCl (Strong) NH4OH
(Weak)
Acidic Red
Mg(NO3)2 HNO3 (Strong) Mg(OH)2 (Weak) Acidic Yellow
NaCl HCl (Strong) NaOH (Strong) Neutral Yellow
K2SO4 H2SO4 (Strong) KOH (Strong) Neutral Yellow
Na2CO3 H2CO3 (Weak) NaOH (Strong) Basic Red

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