Question

In which state does matter spread itself on the surface by decreasing its thickness to form a uniform layer?

• A. Solid
• B. Liquid
• C. Gas
• D. All of the above

Answer 1

The correct option is B

Liquid

Explanation of correct option:

(B) Liquid:

• Matter spread itself on the surface by decreasing its thickness to form a uniform layer in a liquid state because liquids have less intermolecular forces of attraction as compared to solids. Thus they can easily flow forming a uniform layer of minimum thickness.

Explanation of incorrect option:

(A) Solid:

• Solids have strong intermolecular forces of attraction so their shape remains the same and they do not flow as the molecules are tightly packed.

(C) Gases:

• Gases have a negligible or very less intermolecular force of attraction among their particles. hence they move freely in available space.
• Gases spread totally in the all available volume.

Hence, option (B) i.e. liquid is correct.