Question

electric current cannot passes through which of the following : 1)crystall NaCl 2)Moltan NaCl 3)solution of NaCl 4)None of theabove​

Answer 1

Explanation:

1 ) Crystals of NaCl

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Answer 2

Electric current cannot passes through in crystal NaCl.

Option: (1)

Explanation:

• The flow of electric current through a substance is due to the ‘presence of free ions’ in the medium.  

• If we consider the case of sodium chloride, a ‘crystal of sodium chloride’ contains all the molecules which are joined by covalent bond.

• Such a covalent bond is broken when other sodium chloride is melted or sodium chloride is dissolved in water.  

• In both of the cases the sodium chloride divides into the sodium ion and the chloride ion.

• As a result in both of them there is conduction of electricity due to the presence of free ions.

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