Which observation gives the strongest evidence that ions are present in a solution?
Answer and explanation
Correct answer: The solution conducts electric current
Ions are electrically charged particles. When an ionic substance dissolves in water, its ions may become mobile; their movement between electrodes allows the solution to conduct electric current. Therefore electrical conductivity is strong experimental evidence for mobile ions, although the degree of conductivity depends on ion concentration and mobility. Colour, taste, or apparent temperature does not demonstrate the presence of ions and may be unrelated to composition.
Frequently asked questions
What is the correct answer to this question?
The solution conducts electric current
Why is this the correct answer?
Ions are electrically charged particles. When an ionic substance dissolves in water, its ions may become mobile; their movement between electrodes allows the solution to conduct electric current. Therefore electrical conductivity is strong experimental evidence for mobile ions, although the degree of conductivity depends on ion concentration and mobility. Colour, taste, or apparent temperature does not demonstrate the presence of ions and may be unrelated to composition.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
