Same chapter3 marksDifficulty: Medium
What is aqua regia? State its composition and one use.
Study of Compounds: Hydrogen Chloride
3 marksDifficulty: Medium
Write the equation for the laboratory preparation of hydrogen chloride gas from sodium chloride, and state the temperature used.
Original Khojo Papers practice question — not from a past board paper.
Answer
NaCl + H2SO4 → NaHSO4 + HCl, carried out below 200 °C.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Below 200 °C only one hydrogen of the sulphuric acid is replaced, giving sodium hydrogen sulphate. Above 200 °C sodium sulphate is formed instead, but the higher temperature attacks the glass apparatus, so the lower temperature is used.
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