A student takes four test tubes marked P, Q, R and S of 25 {\mL} capacity and fill 10 {\mL} of distilled water in each. He dissolves one spoon full of four different salts in each as - {\KCl} in {\P}, {\NaCl} in {\Q}, {\CaCl}_2 in {\R} and {\MgCl}_2 in {\S}. He then adds about 2 {\mL} of a sample of soap solution to each of the above test-tubes. On shaking the contents of each of the testtubes, he is likely to observe a good amount of lather (foam) in the test tubes marked :

CBSE Class 10 Science 2016 Term II Delhi Set 1 - Question 26

CBSE Class 10 Science 2016 Term II Delhi Set 1

Question : 26 of 36

Marks: +1, -0

A student takes four test tubes marked

P

Q, R

and

S

25 {\mL}

capacity and fill

10 {\mL}

of distilled water in each. He dissolves one spoon full of four different salts in each as

- {\KCl}

{\P}, {\NaCl}

{\Q}, {\CaCl}_2

{\R}

and

{\MgCl}_2

{\S}

. He then adds about

2 {\mL}

of a sample of soap solution to each of the above test-tubes. On shaking the contents of each of the testtubes, he is likely to observe a good amount of lather (foam) in the test tubes marked :

$P$ and $Q$
${R}$ and ${\S}$
$P, Q$ and $R$
$P, Q$ and $S$

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