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प्रश्न
Explain why soap cannot be used in hard water.
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उत्तर
Soaps cannot be used in hard water because they lose their cleansing property when used with it. Soaps do not form lather with hard water and instead form scum, as a result of which they lose their cleansing property.
संबंधित प्रश्न
Would you be able to check if water is hard by using a detergent?
Explain the formation of scum when hard water is treated with soap.
Distinguish between esterfication and saponification reaction with the help of the chemical equations for each.
Use of synthetic detergents causes pollution of water.
How is soap made? Write a word equation involved in soap making.
Consider the following oils :
(I) Mobil oil
(II) Castor oil
(III) Turpentine oil
(IV) Kerosene
(V) Mustard oil
(VI) Coconut oil
Which of these can be used for prepartion of soap?
(a) I, II, III, VI
(b) II, V, VI
(c) II, III, V, VI
(d) II, III, VI
Answer the following question.
In three test tubes A, B, and C, three different liquids namely, distilled water, underground water and distilled water in which a pinch of calcium sulphate is dissolved, respectively are taken. Equal amount of soap Answer is added to each test tube and the contents are shaken. In which test tube will the length of the foam (lather) be longest? Justify your answer.
What are the two different types of molecules found in the soap?
______ are substances which can undergo chemical changes to produce certain materials.
The soap molecule has a
