Chemistry in Everyday Life Test

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Chemistry in Everyday Life Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

Sodium chloride is added to the solution after saponification to cause the :

A
hydrolysis of soap

B
precipitation of soap

C
sedimentation of soap

D
none of these

Solution

Triglycerides are treated with a strong base which releases the fatty acid salt and glycerol.

Soaps are precipitated by salting it out with saturated sodium chloride. Saponification value is the amount of base required to saponify a fat.

Common salt is added to precipitate out all the soap from the aqueous solution. Adding of common salt to soap solution decreases the solubility of soap due to which all the soap precipitates out from the solution in the solid form.

This process is called salting out of soap.

Option B is correct.
Question 2
1 / -0

The long hydrocarbon chain in soap is water-repelling (hydrophobic), which is called:

A
polar tail

B
ring chain

C
non-polar tail

D
none of the above
Question 3
1 / -0

Detergents are sodium salts of a long chain:

A
benzene sulphonic acids

B
alkyl hydrogen sulphate

C
both $$A$$ and $$B$$

D
none of the above

Solution

Detergents consist of alkylbenzenesulfonates or an alkyl hydrogen sulphate a family of compounds that are similar to soaps but more soluble in hard water because the polar sulfonate is less likely than polar carboxyl to bind to calcium and other ions found in hard water.
Question 4
1 / -0

Which of the following substance has bitter taste?

A
Milk

B
Amla

C
Soap solution

D
Salt solution

Solution

Soaps are obtained by treating vegetable or animal oils and fats with a strong alkaline solution. Basic solutions are bitter in taste.
Question 5
1 / -0

Which of the following compounds is a soap?

A
$$CH_3(CH_2)_{16}CONa$$

B
$$CH_3(CH_2)_{16}COONa$$

C
$$CH_3(CH_2)_{16}COOH$$

D
$$CH_3(CH_2)_{16}COOCH_3$$

Solution

$$CH_{3}(CH_{2})_{16}COONa$$ is a soap as soaps are the sodium salts of carboxylic acids and thus will have $$-COONa$$ in their structures.
Question 6
1 / -0

A detergent is :

A
cleaning agent

B
drugs

C
soap

D
catalyst

Solution

A detergent is a cleaning agent.
Question 7
1 / -0

Fats +NaOH $$\rightarrow $$ ___________ + Glycerol.

One of the products formed in this reaction is :

A
Soap

B
Cloth

C
Paper

D
Wood

Solution

Soap is a salt of fatty acid and are obtained by treating vegetable oils or animal fats with a strongly alkaline solution. Fats and oils are composed of triglycerides three molecules of fatty acids are attached to single molecule of glycerol. The alkaline solution which is sodium hydroxide brings about a chemical reaction known as sponification.
Question 8
1 / -0

Which of the following reactions is called saponification?

A
$$CH_3COOCH_3+OH^-\rightarrow CH_3COO^-+CH_3OH$$

B
$$CH_3COO^-Na^+\xrightarrow {HCl}CH_3COOH+NaCl$$

C

D
$$CH_3COOH+CH_3CH_2OH\rightarrow CH_3COOH_2CH_3$$

Solution

Saponification reaction is the hydrolysis of esters by base to produce soaps which are salts of carboxylic acids and alcohol.

Thus option A represents the saponification process.

Option A is correct.
Question 9
1 / -0

Sodium sulphate is added to washing powders to ____________.

A
keep dirt suspended in water

B
keep washing powders dry

C
maintain alkalinity to remove dirt

D
produce whiteness in clothes

Solution

Sodium sulphate is a organic molecule which is used as detergent filler. The main function of it is to keep detergents dry and good in condition.
Question 10
1 / -0

Which the following represents saponification reaction?

A
$$CH_3COONa+NaOH\xrightarrow {CaO}CH_4+Na_2CO_3$$

B
$$CH_3COOH+C_2H_5-OH\xrightarrow {H_2SO_4}CH_3COO C_2H_5+H_2O$$

C
$$2CH_3COOH+2Na\rightarrow 2CH_3COONa+H_2$$

D
$$CH_3COOC_2H_5+NaOH\rightarrow CH_3COONa+C_2H_5OH$$

Solution

Saponification is a process by which esters are converted into carboxylates salts of alkali metals.

Base catalyzed hydrolysis of the ester is called as saponification.

Here: $$\underbrace {CH_3COOC_2H_5}_{Ester}+NaOH\longrightarrow \underbrace {CH_3COONa}_{(Soap)Carboxylate}+C_2H_5OH$$

Option D is correct.

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Chemistry in Everyday Life Test - 32

Result

Chemistry in Everyday Life Test - 32

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SHARING IS CARING

Question 1

hydrolysis of soap

precipitation of soap

sedimentation of soap

none of these

Solution

Question 2

polar tail

ring chain

non-polar tail

none of the above

Question 3

benzene sulphonic acids

alkyl hydrogen sulphate

both $$A$$ and $$B$$

none of the above

Solution

Question 4

Milk

Amla

Soap solution

Salt solution

Solution

Question 5

$$CH_3(CH_2)_{16}CONa$$

$$CH_3(CH_2)_{16}COONa$$

$$CH_3(CH_2)_{16}COOH$$

$$CH_3(CH_2)_{16}COOCH_3$$

Solution

Question 6

cleaning agent

drugs

soap

catalyst

Solution

Question 7

Soap

Cloth

Paper

Wood

Solution

Question 8

$$CH_3COOCH_3+OH^-\rightarrow CH_3COO^-+CH_3OH$$

$$CH_3COO^-Na^+\xrightarrow {HCl}CH_3COOH+NaCl$$

$$CH_3COOH+CH_3CH_2OH\rightarrow CH_3COOH_2CH_3$$

Solution

Question 9

keep dirt suspended in water

keep washing powders dry

maintain alkalinity to remove dirt

produce whiteness in clothes

Solution

Question 10

$$CH_3COONa+NaOH\xrightarrow {CaO}CH_4+Na_2CO_3$$

$$CH_3COOH+C_2H_5-OH\xrightarrow {H_2SO_4}CH_3COO C_2H_5+H_2O$$

$$2CH_3COOH+2Na\rightarrow 2CH_3COONa+H_2$$

$$CH_3COOC_2H_5+NaOH\rightarrow CH_3COONa+C_2H_5OH$$

Solution

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