Q.

Statement I: Hard water does not give lather with soapStatement II : In hard water, the sodium stearate of soap changes to the corresponding calcium magnesium salt which precipitates out

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a

Statement I and Statement II are true.

b

Statement I is true and  statement II is false.

c

Statement I is false and Statement II is true.

d

Statement I and Statement II are false.

answer is A.

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Detailed Solution

The hard water does not gives lather with soap solution, due to the presence of ↑ soluble Ca & Mg saltsThose are Mg(HCO3)2    MgCO3               Ca(HCO3)2     CaCO3The sodium stearate of soap reacts with these salts and converting into insoluble (PPT) calcium and magnesium stearate. Statement I and Statement II are true.
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