MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
Which of these conducts electricity?
Think it through first, then pick an option.
- a Na₂SO₄(s)
- b NaCl(s)
- c MgCl₂(l)
- d C₆H₁₂O₆(l)
Answer and explanation
Correct answer: c MgCl₂(l)
In molten MgCl₂, Mg²⁺ and Cl⁻ are free, so it conducts.
Why the other options are wrong
- a Na₂SO₄(s): In the solid the ions are not free, so it does not conduct.
- b NaCl(s): In solid NaCl the ions are locked in place, so it does not conduct.
- d C₆H₁₂O₆(l): Glucose is covalent, with no ions. The answer the book supports is MgCl₂(l).
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