You are provided with aqueous solutions of three salts —A, B and C, 2-3 drops of blue litmus solution, red litmus solution and phenolphthalein were added to each of thesesolution in separate experiments. The change in coloursof different indicators were recorded in the following table: Sample With blue litmus solution With red litmus solution With phenolphthalein solution A No change No change No change B Turns red No change No change C No change Turns blue Turns pink On the basis of above observations, identify A, B, and C from the following options:

Correct Answer is : A=NaCl,B=NH4Cl,C=CH3COONa

NTSE Stage 2 SAT 2019 Exam Question Paper

Question : 84 of 100

Marks: +1, -0

You are provided with aqueous solutions of three salts —A, B and C, 2-3 drops of blue litmus solution, red litmus solution and phenolphthalein were added to each of thesesolution in separate experiments. The change in coloursof different indicators were recorded in the following table:

Sample	With blue litmus solution	With red litmus solution	With phenolphthalein solution
A	No change	No change	No change
B	Turns red	No change	No change
C	No change	Turns blue	Turns pink

On the basis of above observations, identify A, B, and C from the following options:

$A=NH_4Cl,B=NaCl,C=CH_3COONa$
$A=NH_4Cl,B=CH_3COONa,C==NaCl$
$A=NaCl,B=NH_4Cl,C=CH_3COONa$
$A=CH_3COONa,B=NH_4Cl,C=NaCl$

Validate

Solution:

A neutral salt brings no change with blue litmus solution, red litmus solution and with phenolphthalein solution. An acidic salt turns blue litmus to red litmus solution and brings no changein red litmus solution as well as in phenolphthalein solution.
Basic salt turns red litmus to blue litmus solution and also turns phenolphthalein solution pink.

Sample	Aqueous solution	With blue litmus solution	With red litmus solution	With Phenolphthalein solution
A	Neutral salt (NaCI)	No change	No change	No change
B	Acidic salt $(NH_4CI)$	Turns red	No change	No change
C	Basic salt $(CH_3COONa)$	No change	Turns blue	Turns pink

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