Chemistry in Everyday Life Test

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Chemistry in Everyday Life Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

Tonic usually contains:

A
methanol

B
quinine

C
chloroform

D
ether

Solution

Tonic usually contains quinine and is sold as a carbonated beverage. It (quinine) was used as a prophylactic for malaria and is also mixed in gin. It has a bitter taste.
Question 2
1 / -0

The given compound is:

A
antiseptic

B
antibiotic

C
analgesic

D
pesticide

Solution

The compound given is acetylsalicylic acid which is the chemical name of aspirin.

Aspirin is analgesic.

Hence, option C is correct.
Question 3
1 / -0

Which of the following statements is false about a soap?

A
The soap solution in water is neutral that can be used to wash all kinds of fabrics.

B
Soap forms lather only in soft water.

C
Soap is a metallic salt of higher fatty acids.

D
Soap cannot be used in slightly acidic medium.

Solution

The soap solution in water is alkaline and cannot be used to wash all kinds of fabrics.
Fabrics that are sensitive to alkali cannot be washed with soap solution. They need dry cleaning.
Question 4
1 / -0

Which one of the following statements is incorrect about soaps?

A
Soaps are biodegradable

B
Soaps are sodium salts of higher fatty acids

C
Soaps are prepared from natural oils and fats

D
Soaps can be used in acidic solutions

Solution

Soaps cannot be used in acidic conditions because they lose their cleansing effect due to the formation of insoluble long-chain fatty acids. The pH of these fatty acids is less than 7, which is not good for clothes.
Question 5
1 / -0

The antioxidant which is used to prevent rancidity in foods is:

A
butylated hydroxyl anisole

B
sodium hydroxide

C
sodium carbonate

D
methylated hydroxyl anisole

Solution

Butylated hydroxyl anisole is used to prevent rancidity in foods. Butylated hydroxyanisole is an antioxidant consisting of a mixture of two isomeric organic compounds, 2-tert-butyl-4-hydroxyanisole and 3-tert-butyl-4-hydroxyanisole.
Question 6
1 / -0

Which of the following represent saponification reaction?

A
$$CH_3COOH+NaOH\xrightarrow {CaO} CH_4 + Na_2CO_3$$

B
$$CH_3COOH+C_2H_5OH\xrightarrow {H_2SO_4}CH_3COOC_2H_5+H_2O$$

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

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

Solution

Saponification is the alkaline hydrolysis of an ester.
Thus, the reaction D i.e, $$CH_3COOC_2H_5+NaOH\rightarrow CH_3COONa+C_2H_5OH$$ represents the saponification reaction. In this reaction, ethyl acetate is hydrolyzed in the alkaline medium to form sodium acetate and ethanol.
Question 7
1 / -0

Washing powders contain detergents in the range of (by mass):

A
$$10-15\%$$

B
$$15-30\%$$

C
$$50-60\%$$

D
$$40-50\%$$

Solution

Modern synthetic detergents are alkyl or aryl sulphonates produced from petroleum (or coal) and sulphuric acid. They can be defined as the sodium or potassium salt of a long chain alkyl benzene sulphonic acid or the sodium or potassium salt of a long chain alkyl hydrogen sulphate, that has cleansing properties in water.
They are used in washing powders in a proportion of about $$15-30\%$$.
Question 8
1 / -0

Study the experimental set up shown below.
Which of the following statements is correct regarding the observations made, after the two visking tubes P and Q were placed in dilute iodine solution for 10 minutes ?
[Key : Visking tube allows the molecules of iodine to pass through it.]

A
Solution in visking tube P turns blue - black

B
Solution in visking tube Q turns blue - black

C
Solution in both the visking tubes P and Q turns blue - black

D
Solution in neither of the visking tubes turns blue - black

Solution

If the salivary amylase is boiled, then it will denature the enzyme and will no longer break down the starch to simpler sugars.
Boiling an enzyme denatures the proteins within, and the iodine test - which turns a starch blue with a continued presence of the starch- tells whether or not the starch has been broken down to saccharides.
Question 9
1 / -0

A by product of soap industry is:

A
sodium hydroxide

B
sodium palmitate

C
glycerol

D
both $$B$$ and $$C$$

Solution

Soaps are sodium or potassium salt of fatty acids, made by hydrolysis of fats and oils with bases. This process yields soap as a product and glycerol as by-product.
Question 10
1 / -0

Which of the following is not correctly matched?

A
Hard soaps-sodium salts of fatty acids

B
Soft soaps-potassium salts of fatty acids

C
Hydrophilic-water insoluble

D
None of these

Solution

Hard soaps are the sodium salts of fatty acids and soft soaps are the potassium salts of fatty acids.
Hydrophilic polymers contain polar or charged functional groups, rendering them soluble in water.
A hydrophile is a molecule or other molecular entity that is attracted to, and tends to be dissolved by water.
Option C is correct.

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Re-Attempt Weekly Quiz Competition

Chemistry in Everyday Life Test - 31

Result

Chemistry in Everyday Life Test - 31

Score

-

Rank

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SHARING IS CARING

Question 1

methanol

quinine

chloroform

ether

Solution

Question 2

antiseptic

antibiotic

analgesic

pesticide

Solution

Question 3

The soap solution in water is neutral that can be used to wash all kinds of fabrics.

Soap forms lather only in soft water.

Soap is a metallic salt of higher fatty acids.

Soap cannot be used in slightly acidic medium.

Solution

Question 4

Soaps are biodegradable

Soaps are sodium salts of higher fatty acids

Soaps are prepared from natural oils and fats

Soaps can be used in acidic solutions

Solution

Question 5

butylated hydroxyl anisole

sodium hydroxide

sodium carbonate

methylated hydroxyl anisole

Solution

Question 6

$$CH_3COOH+NaOH\xrightarrow {CaO} CH_4 + Na_2CO_3$$

$$CH_3COOH+C_2H_5OH\xrightarrow {H_2SO_4}CH_3COOC_2H_5+H_2O$$

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

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

Solution

Question 7

$$10-15\%$$

$$15-30\%$$

$$50-60\%$$

$$40-50\%$$

Solution

Question 8

Solution in visking tube P turns blue - black

Solution in visking tube Q turns blue - black

Solution in both the visking tubes P and Q turns blue - black

Solution in neither of the visking tubes turns blue - black

Solution

Question 9

sodium hydroxide

sodium palmitate

glycerol

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

Solution

Question 10

Hard soaps-sodium salts of fatty acids

Soft soaps-potassium salts of fatty acids

Hydrophilic-water insoluble

None of these

Solution

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