Q1
How is HCl gas prepared in the lab?
AHeating NaCl with concentrated H2SO4
BHeating NaCl with water only
CHeating NaCl alone
DMixing NaCl with oxygen
ICSEClass 10 (ICSE)ChemistryCh 8 · Topic 1
Study of Compounds - Hydrogen Chloride
Hydrogen chloride (HCl) is prepared in the laboratory and has distinct physical and chemical properties, forming hydrochloric acid when diss
Core concept
HCl gas is prepared in the lab by heating sodium chloride with concentrated sulphuric acid (salt-acid method).
How it works
HCl gas is colourless, has a pungent smell, is denser than air, and is highly soluble in water, forming hydrochloric acid.
Why it matters
HCl shows an extremely high solubility fountain experiment demonstrating its solubility, and it does not support combustion.
Key detail
Hydrochloric acid reacts with metals, bases, and carbonates, showing typical acidic properties like producing hydrogen gas with reactive metals.
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Quick notes
• HCl prepared by heating NaCl with conc. H2SO4.
• This is the salt-acid method.
• HCl gas: colourless, pungent smell.
• It's denser than air, highly soluble in water.
• Dissolving in water forms hydrochloric acid.
• The fountain experiment shows high solubility.
• HCl does not support combustion.
• HCl reacts with metals, bases, carbonates (acidic properties).