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Explain the formation of scum when hard water is treated with
Science
Science

Class 10

NCERT

Publisher:
NCERT
Subject:
Science
1

Chapter 1: Chemical Reactions and Equations

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2

Chapter 2: Acid,Bases and Salts

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3

Chapter 3: Metals and Non-metals

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4

Chapter 4: Carbon and its Compound

24 questions

Q1
Why are carbon and its compounds used as fuels for most applications?
Q2
Explain the formation of scum when hard water is treated with soap.
Q3
What change will you observe if you test soap with litmus paper (red and blue)?
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5

Chapter 5: Periodic Classification of Elements

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6

Chapter 6: Life Processes

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7

Chapter 7: Control and Coordination

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8

Chapter 8: How do Organism Reproduce?

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9

Chapter 9: Heredity and Evolution

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10

Chapter 10: Light -Reflection and Refraction

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11

Chapter 11: The Human Eye and Colourful World

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Chapter 12: Electricity

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13

Chapter 13: Magnetic Effects of Electric Current

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14

Chapter 14: Sources of Energy

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15

Chapter 15: Our Environment

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16

Chapter 16: Sustainable Management of Natural Resources

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Question
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Explain the formation of scum when hard water is treated with soap.

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Hard water often contains salts of calcium and magnesium. Soap molecules react with the salts of calcium and magnesium and form a precipitate. This precipitate begins floating as an off-white layer over water. This layer is called scum. Soaps lose their cleansing property in hard water because of formation of scum.
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Question Text
Explain the formation of scum when hard water is treated with soap.
Updated OnNov 22, 2022
TopicCarbon and its Compound
SubjectScience
ClassClass 10
Answer TypeText solution:1 Video solution: 1
Upvotes146
Avg. Video Duration4 min