Question:
Which of the following is NOT TRUE?
a. Any increase in temperature of liquid decreases its angle of contact for a given solid-liquid pair.
b. When a soluble substance is dissolved in water, the surface tension of water decreases.
c. When a sparingly soluble substance is mixed with water, the surface tension of water decreases.
d. When insoluble impurity is added into water, surface tension of water decreases.
Which of the following is NOT TRUE?
a. Any increase in temperature of liquid decreases its angle of contact for a given solid-liquid pair.
b. When a soluble substance is dissolved in water, the surface tension of water decreases.
c. When a sparingly soluble substance is mixed with water, the surface tension of water decreases.
d. When insoluble impurity is added into water, surface tension of water decreases.
a. Any increase in temperature of liquid decreases its angle of contact for a given solid-liquid pair.
b. When a soluble substance is dissolved in water, the surface tension of water decreases.
c. When a sparingly soluble substance is mixed with water, the surface tension of water decreases.
d. When insoluble impurity is added into water, surface tension of water decreases.
Show Hint
Check each statement against known effects of solutes and temperature on surface tension.
Updated On: Nov 12, 2026
- c
- a
- d
- b
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
We must find the statement about angle of contact or surface tension that is false.
Step 2: Check the statements
a: a rise in temperature decreases the angle of contact, which is true.
b: a highly soluble substance such as common salt raises the surface tension of water, so this statement is not true.
c: sparingly soluble substances such as phenol or soap lower the surface tension, which is true.
d: insoluble impurities such as oil or grease lower the surface tension, which is true.
Step 3: Result
Statement b is the one that is NOT true, and it appears as option D.
Final Answer:
Statement b is not true. \[ \boxed{\text{(D) }\text{b}} \]
We must find the statement about angle of contact or surface tension that is false.
Step 2: Check the statements
a: a rise in temperature decreases the angle of contact, which is true.
b: a highly soluble substance such as common salt raises the surface tension of water, so this statement is not true.
c: sparingly soluble substances such as phenol or soap lower the surface tension, which is true.
d: insoluble impurities such as oil or grease lower the surface tension, which is true.
Step 3: Result
Statement b is the one that is NOT true, and it appears as option D.
Final Answer:
Statement b is not true. \[ \boxed{\text{(D) }\text{b}} \]
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