Electrolytes and Ionisation

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1. CSCA Chemistry December 2025 Past Paper
   Which of the following is a non-electrolyte? ( )
   • A. Sodium acetate
   • B. Sucrose
   • C. Sodium hydroxide
   • D. Sulfuric acid
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   Jawaban: B

   Answer: B A non-electrolyte does not ionize in water and does not conduct electricity. Sucrose dissolves as molecules and produces no ions. Sodium acetate, sodium hydroxide and sulfuric acid are all electrolytes.
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2. CSCA Chemistry April 2026 Past Paper
   Which of the following substances is an electrolyte? ( )
   • A. Ag
   • B. CO
   • C. $\mathrm{H_{2}}$
   • D. NaOH
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   Jawaban: D

   Answer: D NaOH is a strong base and is an electrolyte.
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3. CSCA Chemistry March 2026 Past Paper
   Which substance conducts electricity when dissolved but is itself a non-electrolyte?
   • A．Hydrogen chloride
   • B．Carbon dioxide
   • C．Sodium hydroxide
   • D．Copper wire
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   Jawaban: B

   $\mathrm { CO } _ { 2 }$ is non-electrolyte but forms $\mathrm { H } _ { 2 } \mathrm { CO } _ { 3 }$ in water (conducts weakly). A/C: electrolytes. D: metal. Answer: B.
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