Which of the following is an example of a gel? MCQ with Answer and Explanation

Which of the following is an example of a gel?
A. Smoke
B. Cheese
C. Fog
D. Milk
Answer: Option B
Solution (By JKSSB Mock Tests)
A gel is a type of colloid where the dispersed phase is a liquid and the dispersed medium is a solid. Cheese, butter, and jellies are classic examples of gels. Milk is an emulsion (liquid in liquid), while fog and smoke are aerosols.

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Practice More chemistry Questions

Question #1
Which of the following is an example of a pure substance?
A. Air
B. Milk
C. Distilled water
D. Sea water

Correct Answer: Option C


Explanation:
Distilled water is a pure compound (H₂O) with a fixed composition and distinct properties. Milk is a colloid of fat, protein, etc. Air is a homogeneous mixture of gases. Sea water is a solution of salts. Pure substances are either elements or compounds; mixtures contain two or more substances physically combined. Distillation removes dissolved salts and impurities.

This question belongs to: Science chemistry
Question #2
The main impurity present in iron ore obtained from mining is:
A. Silica
B. Alumina
C. Carbon
D. Lime

Correct Answer: Option A


Explanation:
The chief impurity in iron ores (hematite, magnetite) is silica (SiO₂), which is acidic gangue. In the blast furnace, limestone (CaCO₃) is added as flux; it decomposes to CaO, which combines with silica to form fusible calcium silicate slag: CaO + SiO₂ → CaSiO₃. This slag floats on molten iron and is removed. Alumina may also be present but silica is the primary impurity.

This question belongs to: Science chemistry
Question #3
In the extraction of copper from copper pyrites, the ore is first concentrated by:
A. Calcination
B. Magnetic separation
C. Leaching
D. Froth flotation

Correct Answer: Option D


Explanation:
Copper pyrites (CuFeS₂) is a sulfide ore, concentrated by froth flotation using pine oil and water. Then roasting, smelting, and refining.

This question belongs to: Science chemistry