Engineering Chemistry Multiple Choice Questions on “Detergents”.
1. Detergents are synthetic soaps like cleansing agents and are also known as ____________
a) Artifacts
b) Detritus
c) Syndets
d) Collagen
Answer: c
Clarification: Detergents are synthetic soaps like cleansing agents and are also known as syndets. They are a mixture of surfactants with “cleaning properties in dilute solutions.
2. Which of the following is also known as invert detergents?
a) Anionic detergents
b) Cationic detergents
c) Non-ionic detergents
d) All detergents comes in the category of invert detergents
Answer: b
Clarification: Cationic detergents are also known as invert detergents. In cationic detergent, the ammonium center is positively charged.
3. Which of the following is an example of non-ionic detergent?
a) Alkyltrimethyl ammonium chloride
b) Sodium salts of alkyl sulphates
c) Sodium salts of alkyl benzene sulphonic acids
d) Polyethers
Answer: d
Clarification: Polyethers derived from ethylene oxide is an example of non-ionic detergent.
4. Which of the following is an example of cationic detergent?
a) Alkyltrimethyl ammonium chloride
b) Sodium salts of alkyl sulphates
c) Sodium salts of alkyl benzene sulphonic acids
d) Polyethers
Answer: a
Clarification: Alkyltrimethyl ammonium chloride is an example of cationic detergent as its ammonium center is positively charged.
5. The detergents which bear negative charge at the soluble end of the chain are called anionic detergents.
a) True
b) False
Answer: a
Clarification: The detergents which bear negative charge at the soluble end of the chain are called anionic detergents. Typical anionic detergents are alkyl benzene sulfonates.
6. If the carbon chain is highly branched, the corresponding detergent will be ____________
a) Soft and biodegradable
b) Soft and non-biodegradable
c) Hard and biodegradable
d) Hard and non-biodegradable
Answer: d
Clarification: If the carbon chain is highly branched, the corresponding detergent will be hard and non-biodegradable.
7. If the carbon chain is linear, the corresponding detergent will be ____________
a) Soft and non-biodegradable
b) Soft and biodegradable
c) Hard and biodegradable
d) Hard and non-biodegradable
Answer: b
Clarification: If the carbon chain is linear, the corresponding detergent will be soft and biodegradable.
8. The % weight of detergent in washing powders is ____________
a) 5 – 10
b) 50 – 70
c) 15 – 30
d) 30 – 45
Answer: c
Clarification: The weight of detergent in washing powders is 15-30% which is quite high as compared to soaps.
9. Which of the following chemical is added in washing powder for keeping the dirt suspended in water?
a) Sodium silicate
b) Inorganic phosphate
c) Carboxy-methyl cellulose
d) Sodium perborate
Answer: c
Clarification: Carboxy-methyl cellulose is added in washing powder for keeping the dirt suspended in water while others are used for bleaching and stabilizing action.
10. Which of the following chemical is added in washing powder for keeping it dry?
a) Sodium silicate
b) Inorganic phosphate
c) Carboxy-methyl cellulose
d) Sodium perborate
Answer: a
Clarification: Sodium silicate is added in washing powder for keeping it dry while others are used for fragrance and cleansing action.