chemistry : class12 Molecular Size of Macromolecules : Macromolecular colloids : Surface Chemistry MCQ Questions and Answers
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Molecular Size of Macromolecules
MCQ questions and answers.
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MCQ Questions
1. What is the approximate size range of particles generally considered colloidal?
A.
0.1 to 1 nm
B.
1 to 1000 nm
C.
1000 to 10,000 nm
D.
10,000 to 100,000 nm
Correct Answer:
1 to 1000 nm
Explanation:
Colloidal particles, including many macromolecules, usually have dimensions in the approximate range of 1 to 1000 nm.
2. Why can macromolecules form colloidal solutions?
A.
They always have very small molecular masses
B.
Their molecular sizes lie within the colloidal range
C.
They are always insoluble in water
D.
They consist only of metal atoms
Correct Answer:
Their molecular sizes lie within the colloidal range
Explanation:
Macromolecules may form colloidal solutions because their large molecular dimensions fall within the colloidal size range.
3. Which of the following is a typical example of a macromolecule with colloidal dimensions?
A.
Sodium ion
B.
Chloride ion
C.
Starch molecule
D.
Water molecule
Correct Answer:
Starch molecule
Explanation:
Starch is a large macromolecule whose molecular size can be within the colloidal range, unlike simple ions and water molecules.
4. The molecular size of a macromolecule is mainly related to its:
A.
Number of constituent repeating units
B.
Colour only
C.
Melting point only
D.
Electrical charge only
Correct Answer:
Number of constituent repeating units
Explanation:
A macromolecule becomes larger as the number of repeating units or monomer units in its chain increases.
5. Which substance has molecular dimensions most likely to be in the colloidal range?
A.
Glucose
B.
Urea
C.
Protein
D.
Sodium chloride
Correct Answer:
Protein
Explanation:
Proteins are macromolecules with large molecular sizes, often lying within the colloidal range.
6. Compared with a simple molecule such as water, a macromolecule generally has:
A.
A much larger molecular size
B.
A smaller molecular size
C.
Exactly the same molecular size
D.
No molecular size
Correct Answer:
A much larger molecular size
Explanation:
Macromolecules contain many atoms or repeating units, so their molecular dimensions are much larger than those of simple molecules such as water.
7. Which one is a macromolecule whose size may be comparable to colloidal particles?
A.
Cellulose
B.
Hydrogen molecule
C.
Oxygen molecule
D.
Ammonia molecule
Correct Answer:
Cellulose
Explanation:
Cellulose is a polymeric macromolecule and its large molecular size can fall within the colloidal range.
8. An increase in the length of a polymer chain generally causes its molecular size to:
A.
Increase
B.
Decrease to zero
C.
Remain exactly unchanged
D.
Become equal to the size of an atom
Correct Answer:
Increase
Explanation:
Adding more repeating units makes the polymer chain longer and increases the overall molecular size of the macromolecule.
9. Which type of substance can have a molecular size between that of a small molecule and a coarse particle?
A.
Macromolecule
B.
Elementary particle
C.
Simple ion only
D.
Single atom only
Correct Answer:
Macromolecule
Explanation:
Macromolecules have dimensions intermediate between those of ordinary small molecules and larger suspended particles, which is characteristic of colloidal size.
10. The large molecular size of a macromolecule is due mainly to its:
A.
Long chain or large number of linked units
B.
Single proton
C.
Absence of atoms
D.
Very low atomic mass
Correct Answer:
Long chain or large number of linked units
Explanation:
Macromolecules are large because many atoms or repeating structural units are linked together in a long chain or extended structure.
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