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Practical Chemistry — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYPractical Chemistry3 Marks
Question
Using dilute sulphuric acid only how will you distinguish between the following: State clearly the chemical reactions taking place and the tests for the gase2ous products.
✓

Answer

(a) Magnesium carbonate and magnesium sulphide.

The dissolution reaction of magnesite in sulphuric acid solutions can be described by the following equation: MgCO3(s)+H2SO4(aq)→MgSO4(aq)+CO2(g)+H2O(l) , the gas CO2 turns lime water milky while magnesium sulphide not turn milky.

(b) Magnesium and lead.- when magnishium react with sulphuric acid then product hydrogen gas evolve which produce pop sound near flame while lead not

Mg ( s ) Magnesium + H 2 SO 4 ( aq ) Sulphuric acid → MgSO 4 ( aq ) Magnesium sulfate + H 2 ( g ) Hydrogen

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