Class 12 Chemistry Mcqs

Q:

Identify the cationic detergent from the following.

A) Cetyltrimethylammonium bromide B) Sodium dodecyl sulphate
C) Pentaerythritol monostearate D) Sodium lauryl sulphate
 
Answer & Explanation Answer: A) Cetyltrimethylammonium bromide

Explanation: Cetyltrimethylammonium bromide is a quaternary salt cation with bromine as the anion. The cationic part participates in the cleansing mechanism. Pentaerythritol monostearate is a non-ionic detergent, whereas sodium dodecyl sulphate and sodium lauryl sulphate are anionic detergents.

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Q:

Dishwashing liquids are examples of ______

A) soaps B) anionic detergents
C) cationic detergents D) non-ionic detergents
 
Answer & Explanation Answer: D) non-ionic detergents

Explanation: Dishwashing liquids are non-ionic detergents. They may be prepared from the reaction of polyethylene glycol with stearic acid. These do not contain any ionic entities in their whole chain.

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12
Q:

What is the use of trisodium phosphate in soap powders?

A) To make the soap act rapidly B) To make it lather
C) To prevent rapid drying D) For good odour
 
Answer & Explanation Answer: A) To make the soap act rapidly

Explanation: Sodium carbonate and trisodium phosphate acts a builders or building agents in powder soaps. These make the soap act more rapidly.

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8
Q:

When a soap is dissolved in ethanol followed by the evaporation of excess solvent, what type of soap is formed?

A) Transparent soap B) Floating soap
C) Shaving soap D) Laundry soap
 
Answer & Explanation Answer: A) Transparent soap

Explanation: When the soap is dissolved in a solution of ethanol while making it and then evaporating the excess ethanol not used in the process, a transparent soap is formed.

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6
Q:

Which of the following causes soap to lather?

A) Sodium carbonate B) Sodium rosinate
C) Sodium silicate D) Borax
 
Answer & Explanation Answer: B) Sodium rosinate

Explanation: Rosin is a chemical compound which is a gum that is added while making soaps. During saponification, it forms sodium rosinate which forms lathers.

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8
Q:

Which of the following is not an antioxidant?

A) BHT B) BHA
C) Saccharin D) Sulphur dioxide
 
Answer & Explanation Answer: C) Saccharin

Explanation: Antioxidants prevent food spoilage by itself reacting with oxygen and protecting the food from oxidation. Butylated hydroxy toluene and butylated hydroxy anisole increase the shelf lives of food like butter. SO₂ is also used in wines, fruits and sugar syrups for preservation.

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19
Q:

Which of the following is not a preservative?

A) Dulcin B) Potassium metasulphite
C) Sodium benzoate D) Sorbic acid salts
 
Answer & Explanation Answer: A) Dulcin

Explanation: Preservatives are chemicals that are added to food to prevent their spoilage and preserve their nutritive value and taste. Salt, sugar and oils are the most common examples. Potassium metasulphite is used in jams. Dulcin is an artificial sweeter.

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14
Q:

Alitame is ______ times sweeter than cane sugar.

A) 50 B) 100
C) 600 D) 2000
 
Answer & Explanation Answer: D) 2000

Explanation: Alitame is a compound consisting of one hydroxy group, three keto groups and a tetra-methyl sulphur containing cyclic group. It is a very strong sweetener and provides uncontrollable sweetness to food.

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