Which of the following is not an electrolyte in molten state?
A
Cryolite
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B
Sylvine
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C
Urea
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D
Rock salt
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Solution
The correct option is D Urea As Cryolite, Sylvine (KCl) and Rock salt have ions in the free state (free ions), they conduct electricity in the molten state.
But in urea (NH2CONH2) there are no free ions to conduct electricity. So, urea is not an electrolyte in the molten state.