Chemistry in Everyday Life Test

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Chemistry in Everyday Life Test - 8

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Weekly Quiz Competition

Question 1
1 / -0.25

What are the hydrolysis products of glyceryl oleate (C₁₇ H₃₂ COO)₃ C₃ H₅ during preparation of soap?

A
C₁₇ H₃₂ COONa+C₃ H₅ OH

B
C₁₇ H₃₂ COOH+CH₃ CH₂ CH₂ OH

C
C₁₇ H₃₂ COOH+CH₂ OH −CHOH −CH₂ OH

D
C₁₇ H₃₂ COONa+CH₂ OH −CHOH −CH₂ OH

Solution
Question 2
1 / -0.25

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
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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
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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
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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 .
Question 6
1 / -0.25

Name an artificial sweetener which is derivative of sucrose

A
Saccharine

B
Sucrolose

C
Sucrobenzamide

D
Aspartame

Solution

Surolose is trichloro derivative of sucrose. Its appearance and taste are like sugar.
Question 7
1 / -0.25

What is the problem faced while using alitame as artificial sweetener?

A
It decomposes when added to the food items

B
It provides a huge number of calories to the food

C
It is difficult to control the sweetness of food while using it

D
It increases the volume of the contents to a large extent

Solution

Alitame is high potency sweetener although, it is more stable than aspartame, the control of sweetness of food is difficult while using it
Question 8
1 / -0.25

Which of the following are not used as food preservatives ?

A
Sodium salt of benzoic acid

B
Sodium salt of sorbic acid

C
Sodium salt of propanoic acid

D
Sodium salt of palmitic acid

Solution

Sodium benzoate is the most important food preservative. Sodium salts of few more acids which can be used as preservatives are sorbic acid and propanoic acid.
Question 9
1 / -0.25

Refrigeration helps in food reservation by:

A
Killing the germs

B
Reducing the retes of biochemical reaction

C
Destroying enzyme action

D
Sealing the food with a layer of ice

Solution

At low temperatures, the rate of biochemical reactions is reduced which stops the growth of bacteria hence preventing the food from getting spoiled.
Question 10
1 / -0.25

Which of the following is not a food additive?

A
Preservatives

B
Sweetening agents

C
Flavours

D
Oxidants

Solution

Antioxidants are added to food to prevent it from spoiling.

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Chemistry in Everyday Life Test - 8

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Chemistry in Everyday Life Test - 8

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Question 1

C17 H32 COONa+C3 H5 OH

C17 H32 COOH+CH3 CH2 CH2 OH

C17 H32 COOH+CH2 OH −CHOH −CH2 OH

C17 H32 COONa+CH2 OH −CHOH −CH2 OH

Solution

Question 2

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

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

Medicated soaps contain alcohol to prevent rapid drying

Potassium soaps are soft to the skin than sodium soaps

Solution

Question 3

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

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

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

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

Solution

Question 4

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

It is not easily biodegraded

It is a sodium salt of fatty acids

It is a surface active reagent

Solution

Question 5

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

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

I, II and III are non-biodegradable detergents

I is biodegradable and II, III are non-biodegradable

Solution

Question 6

Saccharine

Sucrolose

Sucrobenzamide

Aspartame

Solution

Question 7

It decomposes when added to the food items

It provides a huge number of calories to the food

It is difficult to control the sweetness of food while using it

It increases the volume of the contents to a large extent

Solution

Question 8

Sodium salt of benzoic acid

Sodium salt of sorbic acid

Sodium salt of propanoic acid

Sodium salt of palmitic acid

Solution

Question 9

Killing the germs

Reducing the retes of biochemical reaction

Destroying enzyme action

Sealing the food with a layer of ice

Solution

Question 10

Preservatives

Sweetening agents

Flavours

Oxidants

Solution

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C₁₇ H₃₂ COONa+C₃ H₅ OH

C₁₇ H₃₂ COOH+CH₃ CH₂ CH₂ OH

C₁₇ H₃₂ COOH+CH₂ OH −CHOH −CH₂ OH

C₁₇ H₃₂ COONa+CH₂ OH −CHOH −CH₂ OH

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

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

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

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