Question

Which of the following solutions will conduct electricity most effectively?

• A. Glucose solution
• B. Urea solution
• C. Sodium chloride solution
• D. Sugar solution

Hint:

Strong electrolytes completely ionize in water and conduct electricity efficiently. Examples: \[ NaCl,\ HCl,\ KOH \] Non-electrolytes like sugar and glucose do not produce ions.

Answer 1

The Correct Option is C

Concept: Electrical conductivity in aqueous solutions depends upon:
• Presence of ions
• Number of free moving charged particles Substances are classified as:
• Electrolytes
• Non-electrolytes Electrolytes dissociate into ions in aqueous solution and conduct electricity.

Step 1: Analyze glucose solution.
Glucose is a covalent compound. In water: \[ \text{Glucose} \rightarrow \text{No ions} \] Hence glucose solution conducts electricity very poorly.

Step 2: Analyze urea solution.
Urea is also a covalent molecular compound. It dissolves in water but does not ionize. Therefore: \[ \text{Poor conductor} \]

Step 3: Analyze sodium chloride solution.
Sodium chloride is an ionic compound. In water: \[ NaCl \rightarrow Na^+ + Cl^- \] Large number of ions are produced. These ions carry electric current efficiently. Hence: \[ \text{Strong conductor} \]

Step 4: Analyze sugar solution.
Sugar solution also does not produce ions. Hence conductivity is negligible. Therefore, sodium chloride solution conducts electricity most effectively. Thus, the correct answer is: \[ \boxed{\text{(C) Sodium chloride solution}} \]