Which of the following is used to remove grease stains from clothes? MCQ with Answer and Explanation

Which of the following is used to remove grease stains from clothes?
A. Sodium chloride
B. Detergent
C. Ethanol
D. Vinegar
Answer: Option B
Solution (By JKSSB Mock Tests)
Detergents emulsify grease by forming micelles around oil droplets, removing them from fabric. Soap does same but less effective in hard water.

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Practice More chemistry Questions

Question #1
Vulcanized rubber has better properties due to:
A. Addition of plasticizers
B. Cross-linking of polymer chains with sulfur
C. Removal of impurities
D. Addition of carbon black

Correct Answer: Option B


Explanation:
Sulfur forms disulfide cross-links between polyisoprene chains, providing elasticity, tensile strength, and resistance to temperature changes. Carbon black is filler/additive for reinforcement but not the vulcanization agent.

This question belongs to: Science chemistry
Question #2
The reaction 2H₂O → 2H₂ + O₂ is a:
A. Double displacement reaction
B. Combination reaction
C. Displacement reaction
D. Decomposition reaction

Correct Answer: Option D


Explanation:
Water breaks down into hydrogen and oxygen when electricity is passed (electrolysis). A single reactant yields two or more products, hence decomposition. It is also a redox reaction. Combination is the opposite; displacement involves replacing an ion.

This question belongs to: Science chemistry
Question #3
The micelle formation by soap in water is possible due to:
A. Hydrophilic head and hydrophobic tail
B. Electrostatic repulsion
C. Covalent bonding with dirt
D. Only hydrophobic interaction

Correct Answer: Option A


Explanation:
Soap molecules have a hydrophilic ionic head (COO⁻Na⁺) and a long hydrophobic hydrocarbon tail. In water, the tails aggregate away from water, forming a spherical micelle with heads outward. The hydrophobic core dissolves oily dirt, which is then washed away. This structure is stabilized by ion-dipole interactions. Detergents work similarly but with different head groups.

This question belongs to: Science chemistry