Chemistry in Everyday Life Test

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Chemistry in Everyday Life Test - 43

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Weekly Quiz Competition

Question 1
1 / -0

Which type of chemical substances is disparlure?

A
Detergent

B
Antioxidant

C
Pheromones

D
Preservative

Solution

Disparlure is a pheromones that attracts insects. Pheromones are an additional form of chemical communication that occurs between rather than within individuals.
Question 2
1 / -0

To prevent food from spoilage by microorganism, which substance is used ?

A
Amato

B
Aspartame

C
Salt of sorbic acid

D
Tetrazine

Solution

Salt of sorbic acid is used to prevent food from spoilage by microorganism.
Question 3
1 / -0

Which of the following is useful as a food preservative ?

A
Sucralose

B
Salts of sorbic acid

C
Ascorbic acid

D
Citric acid

Solution

Salts of sorbic acid are used as preservative in cheese, baked food, pickles and meat.

Option B is correct.
Question 4
1 / -0

Tranquillisers are the substances used for treatment of:

A
cancer

B
AIDS

C
mental diseases

D
physical diorders

Solution

Tranquillisers reduce anxiety and are employed for treatment of mental disease.
Question 5
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Which of the following represents a synthetic detergent?

A
$${ C }_{ 15 }{ H }_{ 31 }COOK$$

B
$$C{ H }_{ 3 }{ \left( C{ H }_{ 2 } \right) }_{ 6 }COONa$$

C

D
None of the above

Solution

The sodium salt of the n-dodecyl benzene sulphonic acid (option $$C$$) represents a synthetic detergent. It is an anionic detergent and used in toothpaste and in the house for cleaning purpose. The anionic part of detergent takes part in the cleansing action.
$$ \displaystyle { C }_{ 15 }{ H }_{ 31 }COOK$$ is a potassium soap. It is soft soap.
$$ \displaystyle C{ H }_{ 3 }{ \left( C{ H }_{ 2 } \right) }_{ 6 }COONa$$ is not a soap as it contains less than 12 $$C$$ atoms.
Question 6
1 / -0

Which of the following is not a target molecule for drug function in body?

A
Vitamins

B
Proteins

C
Lipids

D
Carbohydrates

Solution

A target molecule for drug function in body is the entity which can bind with the drug/ligand resulting in a change in its behavoiur. Proteins, Lipids, Carbohydrates nucleic acids and various enzymes are target molecules for drug function in the body.
Vitamin is not a target molecule for drug function in the body.

Option A is correct.
Question 7
1 / -0

Select the detergent that is used to prepare cosmetics.

A
DDBS

B
Polyethylene glycol

C
Cetyltrimethylammonium chloride

D
LAS

Solution

Cetyltremethyl ammonium chloride is a cationic detergent. It is used to prepare cosmetics because it possesses germicidal properties.
Question 8
1 / -0

Potassium metabisulphite is a:

A
Preservative

B
Antioxidant

C
Artificial sweetner

D
Both (A) and (B)

Solution

Potassium metabisulphite, $$K_2S_2O_5$$ is, a white crystalline solid with a pungent odour of sulphur. It is used as an antimicrobial preservative, antioxidant and bleaching agent in food.

The potassium metabisulfite preservative is an additive that is commonly used in households for wine-making, but also for preserving all kinds of vegetables and fruit.
Question 9
1 / -0

Which one of the following is not a tranquiliser?

A
Equanil

B
Veronal

C
Salvarsan

D
Serotonin

Solution

A tranquillizer refers to a drug which is designed for the treatment of anxiety, fear, tension, agitation, and disturbances of the mind, specifically to reduce states of anxiety and tension.

Equanil, veronal and serotonin are tranquillizers, whereas salvarsan is an antibacterial (antibiotic) drug.

Hence, option C is correct.
Question 10
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A sample of peanut oil weighing $$2$$ added to $$25$$mL of $$0.40$$M KOH. After saponification is complete, $$8.5$$mL of $$0.28$$M $$H_2SO_4$$ is needed to neutralize excess of KOH. The saponification number of peanut oil is: (Saponification number is defined as the milligrams of KOH consumed by $$1$$g of oil).

A
$$146.72$$

B
$$223.44$$

C
$$98.9$$

D
none of these

Solution

Reaction of $$H_2SO_4$$ with $$KOH$$:
$$H_2SO_4 + 2KOH \rightarrow K_2SO_4 + 2H_2O$$
Moles of $$H_2SO_4$$ used $$=\dfrac{0.28}{1000}\times 8.5=0.00238 mol$$
For 1 mol of $$H_2SO_4$$ , 2 mol of $$KOH$$ is used, therefore, for 0.00238 mol of $$H_2SO_4$$ moles of $$KOH$$ used$$=0.00238\times2=0.00476 mol$$
Moles of $$KOH$$ initially added$$=\dfrac{0.4}{1000}\times 25=0.01 mol$$
Therefore, moles of $$KOH$$ consumed $$=0.01-0.00476=0.00524 mol$$
mg of $$KOH$$ used $$=0.00524\times 56\times 1000=293.44mg$$
Since saponification number is mg of KOH used to react with 1g of fat, dividing the above weight by 2 we get$$=\dfrac{293.44}{2}=146.72$$

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Re-Attempt Weekly Quiz Competition

Chemistry in Everyday Life Test - 43

Result

Chemistry in Everyday Life Test - 43

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SHARING IS CARING

Question 1

Detergent

Antioxidant

Pheromones

Preservative

Solution

Question 2

Amato

Aspartame

Salt of sorbic acid

Tetrazine

Solution

Question 3

Sucralose

Salts of sorbic acid

Ascorbic acid

Citric acid

Solution

Question 4

cancer

AIDS

mental diseases

physical diorders

Solution

Question 5

$${ C }_{ 15 }{ H }_{ 31 }COOK$$

$$C{ H }_{ 3 }{ \left( C{ H }_{ 2 } \right) }_{ 6 }COONa$$

None of the above

Solution

Question 6

Vitamins

Proteins

Lipids

Carbohydrates

Solution

Question 7

DDBS

Polyethylene glycol

Cetyltrimethylammonium chloride

LAS

Solution

Question 8

Preservative

Antioxidant

Artificial sweetner

Both (A) and (B)

Solution

Question 9

Equanil

Veronal

Salvarsan

Serotonin

Solution

Question 10

$$146.72$$

$$223.44$$

$$98.9$$

none of these

Solution

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