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. Detergent
B. Vinegar
C. Sodium chloride
D. Ethanol
Answer: Option A
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
In the extraction of iron in a blast furnace, limestone is added to:
A. Reduce iron oxide
B. Increase carbon content
C. Remove silica as slag
D. Lower the melting point of iron

Correct Answer: Option C


Explanation:
Limestone (CaCO₃) decomposes to CaO, which is a basic flux. It reacts with the acidic impurity silica (SiO₂) to form calcium silicate (CaSiO₃), a fusible slag: CaO + SiO₂ → CaSiO₃. Slag floats on molten iron and is tapped separately. Reduction is done by CO/coke. Flux makes gangue removal easier. Slag is used in cement, road building.

This question belongs to: Science chemistry
Question #2
Which of the following pairs represents isobars?
A. Carbon-12 and Carbon-14
B. Chlorine-35 and Chlorine-37
C. Hydrogen and Deuterium
D. Argon-40 and Calcium-40

Correct Answer: Option D


Explanation:
Isobars are atoms of different elements with the same mass number but different atomic numbers. Argon (Z=18) and Calcium (Z=20) both have a mass number of 40, making them isobars. Options A, B, and D are isotopes, as they represent the same element with different mass numbers.

This question belongs to: Science chemistry
Question #3
The bond in CO is actually a triple bond with a coordinate covalent bond. The total number of electrons shared between C and O in CO is:
A. 6
B. 2
C. 8
D. 4

Correct Answer: Option A


Explanation:
CO has a triple bond: one sigma and two pi bonds, with a coordinate covalent character where oxygen donates a lone pair to carbon, forming a bond similar to triple bond. Total shared electrons = 6 (three pairs). Lewis structure shows :C≡O: with formal charges. The bond order is 3. It is isoelectronic with N₂ and CN⁻.

This question belongs to: Science chemistry