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ICSE Class 10 Chemistry Question 5 of 62

Study of Compounds — Sulphuric Acid — Question 13

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Question

Question 13

State the observation seen when conc. H2SO4 is added to –

(i) sucrose

(ii) hydrated copper [II] sulphate.

Answer

(i) Conc. H2SO4 dehydrates sucrose to a black spongy charged mass of carbon sugar charcoal.

C12H22O11→Conc. H2SO412C [sugar charcoal]+11H2O\text{C}_{12}\text{H}_{22}\text{O}_{11}\xrightarrow{\text{Conc. H}_2\text{SO}_4} \text{12C} \small{\space[sugar\space charcoal]} + \text{11H}_2\text{O}

(ii) The blue coloured hydrous copper sulphate changes to white anhydrous copper sulphate as the water of crystallization is removed.

CuSO4.5H2O→Conc. H2SO4CuSO4 [White Anhydrous]+5H2O\text{CuSO}_4\text{.5H}_2\text{O} \xrightarrow{\text{Conc. H}_2\text{SO}_4} \text{CuSO}_4 \text{ [White Anhydrous]} + 5\text{H}_2\text{O}