An example of a strong electrolyte is

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(D) strong electrolyte is a substance that dissociates completely into ions in an aqueous solution.$(A)$ Urea $(NH_2CONH_2)$ is a non-electrolyte.$(B)

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Sodium acetate

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(D) strong electrolyte is a substance that dissociates completely into ions in an aqueous solution.$(A)$ Urea $(NH_2CONH_2)$ is a non-electrolyte.$(B)$ Ammonium hydroxide $(NH_4OH)$ is a weak electrolyte.$(C)$ Sugar $(C_{12}H_{22}O_{11})$ is a non-electrolyte.$(D)$ Sodium acetate $(CH_3COONa)$ is a salt of a strong base $(NaOH)$ and a weak acid $(CH_3COOH)$. Salts are generally strong electrolytes because they dissociate completely in water: $CH_3COONa(aq) \rightarrow CH_3COO^{-}(aq) + Na^{+}(aq)$.

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