help transfer of message to receptors

mimic natural chemical messengers

inhibit the catalytic activity of the enzyme

mimic natural chemical messengers

MCQ Questions for Class 12 Engineering Chemistry Chemistry In Everyday Life Quiz 5

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

0%
butylated hydroxyl anisole
0%
sodium hydroxide
0%
sodium carbonate
0%
methylated hydroxyl anisole

Which of the following statements is false about a soap?

0%
The soap solution in water is neutral that can be used to wash all kinds of fabrics.
0%
Soap forms lather only in soft water.
0%
Soap is a metallic salt of higher fatty acids.
0%
Soap cannot be used in slightly acidic medium.

Which one of the following statements is incorrect about soaps?

0%
Soaps are biodegradable
0%
Soaps are sodium salts of higher fatty acids
0%
Soaps are prepared from natural oils and fats
0%
Soaps can be used in acidic solutions

Which of the following represent saponification reaction?

0%
$CH_3COOH+NaOH\xrightarrow {CaO} CH_4 + Na_2CO_3$
0%
$CH_3COOH+C_2H_5OH\xrightarrow {H_2SO_4}CH_3COOC_2H_5+H_2O$
0%
$2CH_3COOH+2Na\rightarrow CH_3COONa+H_2$
0%
$CH_3COOC_2H_5+NaOH\rightarrow CH_3COONa+C_2H_5OH$

Explanation

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.

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

0%
$10-15\%$
0%
$15-30\%$
0%
$50-60\%$
0%
$40-50\%$

Explanation

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 $15-30\%$ .

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.]

0%
Solution in visking tube P turns blue - black
0%
Solution in visking tube Q turns blue - black
0%
Solution in both the visking tubes P and Q turns blue - black
0%
Solution in neither of the visking tubes turns blue - black

Water can be tested by :

0%
smell
0%
test
0%
Hydrated $CuSO_4$
0%
Anhydrous $CoCl_3$ which change the colour to pink

Explanation

Anhydrous

$CoCl_3$ which change the colour to pink.

A by product of soap industry is:

0%
sodium hydroxide
0%
sodium palmitate
0%
glycerol
0%
both $B$ and $C$

Which of the following is not correctly matched?

0%
Hard soaps-sodium salts of fatty acids
0%
Soft soaps-potassium salts of fatty acids
0%
Hydrophilic-water insoluble
0%
None of these

Sodium sulphate is added to washing powders to ____________.

0%
keep dirt suspended in water
0%
keep washing powders dry
0%
maintain alkalinity to remove dirt
0%
produce whiteness in clothes

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

0%
hydrolysis of soap
0%
precipitation of soap
0%
sedimentation of soap
0%
none of these

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

0%
polar tail
0%
ring chain
0%
non-polar tail
0%
none of the above

The hydrophilic end of synthetic detergent is:

0%
$CH_3(CH_2)_{10}-CH_2-$
0%
$-CH_3$
0%
$-CH_2-CH_3$
0%
$-COO^-Na^+$

Detergents are sodium salts of a long chain:

0%
benzene sulphonic acids
0%
alkyl hydrogen sulphate
0%
both $A$ and $B$
0%
none of the above

Which of the following substance has bitter taste?

0%
Milk
0%
Amla
0%
Soap solution
0%
Salt solution

Which of the following compounds is a soap?

0%
$CH_3(CH_2)_{16}CONa$
0%
$CH_3(CH_2)_{16}COONa$
0%
$CH_3(CH_2)_{16}COOH$
0%
$CH_3(CH_2)_{16}COOCH_3$

Explanation

$CH_{3}(CH_{2})_{16}COONa$ is a soap as soaps are the sodium salts of carboxylic acids and thus will have

$-COONa$ in their structures.

A detergent is :

0%
cleaning agent
0%
drugs
0%
soap
0%
catalyst

Fats +NaOH

$\rightarrow$ ___________ + Glycerol.

One of the products formed in this reaction is :

0%
Soap
0%
Cloth
0%
Paper
0%
Wood

Which of the following reactions is called saponification?

0%
$CH_3COOCH_3+OH^-\rightarrow CH_3COO^-+CH_3OH$
0%
$CH_3COO^-Na^+\xrightarrow {HCl}CH_3COOH+NaCl$
0%
0%
$CH_3COOH+CH_3CH_2OH\rightarrow CH_3COOH_2CH_3$

Which element(s) can be used to demonstrate a beating heart experiment?

0%
Mecury
0%
Sodium
0%
Galium
0%
Germanium

Enzymes provide active sites for holding the substrate molecules through a variety of interactions like:

0%
covalent bonding
0%
dipole-dipole interaction
0%
ionic bonding
0%
hydrogen bonding

Which the following represents saponification reaction?

0%
$CH_3COONa+NaOH\xrightarrow {CaO}CH_4+Na_2CO_3$
0%
$CH_3COOH+C_2H_5-OH\xrightarrow {H_2SO_4}CH_3COO C_2H_5+H_2O$
0%
$2CH_3COOH+2Na\rightarrow 2CH_3COONa+H_2$
0%
$CH_3COOC_2H_5+NaOH\rightarrow CH_3COONa+C_2H_5OH$

Explanation

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.

________ is the additive used in transparent soaps.

0%
Potassium bicarbonate
0%
Stearic acid
0%
Salicyclic acid
0%
Glycerine

Explanation

Glycerine is the additive used in transparent soaps.

Glycerin, also known as glycerol, is a thick, transparent and non-toxic liquid that is commonly found in soaps.

Glycerin is a natural by-product of the saponification process. When oil reacts with alkaline, it forms soap and glycerol.

Option

$D$ is correct.

The soap can be hardened by :

0%
adding sodium carbonate or sodium silicate during its manufacture
0%
adding sodium chloride
0%
adding potassium hydroxide
0%
adding animal fat and coconut oil

The process of making soap by the hydrolysis of fats and oils with alkalis is called:

0%
hydrolysis
0%
saponification
0%
esterification
0%
none of the above

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

0%
hydrolysis of soap
0%
precipitation of soap
0%
sedimentation of soap
0%
none of these

_________________are used to control body temperature during fever.

0%
Antipyretics
0%
Antiseptics
0%

Analgesics
0%
Antihistamines

What are used to control body temperature during fever?

0%
Antipyretics
0%
Analgesics
0%
Antidiuretics
0%
Antibiotic

Which of the following is used to control body temperature during fever:

0%
Antihistamine
0%
Antiseptics
0%
Antipyretic
0%
Antidiuretic

Enzymes provide active sites for holding the substrate molecules through a variety of interactions like:

0%
ionic bonding
0%
metallic bonding
0%
hydrogen bonding
0%
covalent bonding

Agonists can:

0%
inhibit function of receptors
0%
mimic natural chemical messengers
0%
help transfer of message to receptors
0%
inhibit the catalytic activity of the enzyme

Drugs that bind to the receptor sites and inhibit its natural function are called analgesics.

0%
True
0%
False

When drugs attach to allosteric sites on enzymes, the shapes of active sites radically are affected so that the substrate molecules cannot recognise the active sites.

0%
True
0%
False

Drugs that bind to the receptor site and inhibit its natural function are called _________________

0%
Antagonists
0%
Enzymes
0%
Molecular targets
0%
Agonists

Some drugs attach on the enzymes to sites other than active sites. These are called as______

0%
Allosteric sites
0%
Episteric sites
0%
Inhibitor sites
0%
Non-Inhibitor sites

Drugs that bind to the receptor sites and inhibit its natural function, are called:

0%
antipyretics
0%
analgesics
0%
agonist
0%
antagonist

The chemical substances which relieve the pain either completely or partially are called laxatives.

0%
True
0%
False

Which of the following are the chemical substances that decrease anxiety?

0%
tranquilizers
0%
hallucinogens
0%
opiates
0%
cocaine

Which of the following is used in the management of psychoses and neuroses?

0%
Tranquilizers
0%
Opiates
0%
Hallucinogens
0%
Cocaine

Tranquilizers can act as:

0%
antiallergens
0%
antihypertensives
0%
antibiotics
0%
muscle relaxants

Agonists cannot:

0%
inhibit function of receptors
0%
mimic natural chemical messengers
0%
control body temperature during fever
0%
relieve the pain

Examples of antipyretics are:

0%
paracetamol
0%
morphine
0%
Barbituric acid
0%
para-amino phenol

Histamine is responsible for the nasal congestion associated with common cold and allergic response to pollen.

0%
True
0%
False

Which of the following plays important role in controlling movement, motivation and cognition?

0%
Noradrenaline
0%
Dopamine
0%
Amphetamine
0%
Adrenaline

Which of the following increases blood pressure and heart beat?

0%
Noradrenaline
0%
Dopamine
0%
Serotonin
0%
Adrenaline

Examples of antacids are:

0%
sodium hydroxide
0%
sodium bicarbonate
0%
magnesium hydroxide
0%
urea

Urea is responsible for the nasal congestion associated with common cold and allergic response to pollen.

0%
True
0%
False

The chemical substances which neutralise the excess of acid generated in the stomach and maintain the normal pH value are called:

0%
Analgesics
0%
Antacids
0%
Antidiarrheal
0%
Antibiotics

Which of the following are artificial sweeteners?

0%
Sodium benzoate
0%
Saccharin
0%
Galactose
0%
Aspartame

An example of food preservative is:

0%
Sodium benzoate
0%
Adipic Acid
0%
Calcium Benzoate
0%
Alcohol

Explanation

An example of food preservative is sodium benzoate

$C_6H_5COONa$ .

It is safely used in limited amounts and is metabolized by conversion to hippuric acid

$C_6H_5CONHCH_2COOH$ , which is ultimately excreted into urine.

It is bacteriostatic and fungistatic under acidic conditions. Thus, it prevents the growth of microorganisms in food materials.

Option A is correct.

CBSE Questions for Class 12 Engineering Chemistry Chemistry In Everyday Life Quiz 5 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

CBSE Questions for Class 12 Engineering Chemistry Chemistry In Everyday Life Quiz 5 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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