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Hydrogen chloride dissolved in water conducts electricity because:
AHCl ionises in water to give H+ and Cl- ions
BHCl gives off heat
CWater is acidic under typical conditions
DHCl is a metal across all cases
Answer & Solution
Correct answer: A. HCl ionises in water to give H+ and Cl- ions
1. In pure liquid HCl the molecule is covalent and non-conducting.
2. When dissolved in water, HCl reacts with H2O to give H3O+ and Cl-.
3. Free ions can carry current.
4. So aqueous HCl conducts electricity by ionisation.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 2 'Chemical Bonding'_
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