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Question

Which of the following compounds will be dissociated into its constituent ions?

A
Solid NaCl
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B
Molten NaCl
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C
Solid CaCl2
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D
Molten CaCl2
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Solution

The correct options are
B Molten NaCl
D Molten CaCl2
When electric current is passed through an electrolyte in its molten or aqueous state, the electrolyte is dissociated into its constituent ions.
Molten NaCl breaks down to form Na+ and Cl where Sodium transfers its valence electron to Chlorine. So Sodium gets one positive charge and Chlorine gets one negative charge.
Molten CaCl2 breaks down to form Ca2+ and two Cl ion where Calcium transfers its two valence electron to Chlorine. Hence Calcium gets two positive charges and each Chlorine atom gets one negative charge.

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