Which observation provides experimental evidence that an acidic solution contains ions?
Answer and explanation
Correct answer: The acidic solution conducts electric current
Electric current in a liquid requires mobile charged particles. When an acid dissolves in water, it ionises or dissociates to produce ions such as H₃O⁺ and a corresponding negative ion. These ions move between the electrodes and carry charge, so conductivity is evidence for their presence. Therefore option A is correct. Colour change, loss of mass, or freezing does not by itself prove that ions are present.
Frequently asked questions
What is the correct answer to this question?
The acidic solution conducts electric current
Why is this the correct answer?
Electric current in a liquid requires mobile charged particles. When an acid dissolves in water, it ionises or dissociates to produce ions such as H₃O⁺ and a corresponding negative ion. These ions move between the electrodes and carry charge, so conductivity is evidence for their presence. Therefore option A is correct. Colour change, loss of mass, or freezing does not by itself prove that ions are present.
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.
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