Chemistry in Everyday Life Test

Result

Chemistry in Everyday Life Test - 5

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Weekly Quiz Competition

Question 1
4 / -1

What are the hydrolysis products of glyceryl oleate (C₁₇H₃₂COO)₃ C₃H₅ during preparation of soap?

A
C₁₇H₃₂COONa+C₃H₅OH

B
C₁₇H₃₂COOH+CH₃CH₂CH₂OH

C
C₁₇H₃₂COOH+CH₂OH−CHOH−CH₂OH

D
C₁₇H₃₂COONa+CH₂OH−CHOH−CH₂OH

Solution
Question 2
4 / -1

Which of the following is not a correct statement?

A
Transparent soaps are made by dissolving the soap in ethanol and then evaporating excess solvent

B
Soaps that float in water are made by beating tiny air bubbles before their hardening

C
Medicated soaps contain alcohol to prevent rapid drying

D
Potassium soaps are soft to the skin than sodium soaps

Solution

Shaving soaps contain glycerol to prevent rapid drying.
Question 3
4 / -1

Soaps do not work in hard water containing calcium and magnesium ions because

A
Ca²⁺ and Mg²⁺ ions form insoluble calcium and magnesium salts in the form of scum

B
Na⁺ and K⁺ present in soap react with Ca²⁺ and Mg²⁺ and hinder cleansing process

C
A large amount of soap is to be used in presence of Ca²⁺ and Mg²⁺

D
Scum formed by combination of Na⁺,Ca²⁺ and Mg²⁺ stick to the cloth and are not removed on agitation

Solution

Ca²⁺ and Mg²⁺ ions form insoluble calcium and magnesium soaps respectively when sodium or potassium soaps are dissolved in hard water.
These insoluble soaps separate as scum in water and are useless as cleansing agent.
Question 4
4 / -1

Which is not true for a detergent molecule?

A
It has a non-polar organic part and a polar group

B
It is not easily biodegraded

C
It is a sodium salt of fatty acids

D
It is a surface active reagent

Solution

Detergent are sodium salt of sulphonic acids.
Question 5
4 / -1

Examples of three detergents are given below. Mark the correct statement following the examples.

A
I and II are non-biodegradable detergents and III is biodegradable

B
I and II are biodegradable detergents and III is non-biodegradable

C
I, II and III are non-biodegradable detergents

D
I is biodegradable and II, III are non-biodegradable

Solution

Detergent having straight hydrocarbon chains are easily degraded by microorganism while detergents with branched hydrocarbon chains are generally non-biodegradable .