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ICSE Class 10 Chemistry Question 22 of 24

Solved 2023 Question Paper ICSE Class 10 Chemistry — Question 22

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Question

Question 8(ii)

Differentiate between the following pairs based on the criteria given in the brackets:

(a) Cane sugar and hydrated copper sulphate [using concentrated H2SO4]

(b) Sulphuric acid and hydrochloric acid [type of salts formed]

Answer

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

C12H22O11→Conc. H2SO412Csugar charcoal+11H2O\text{C}_{12}\text{H}_{22}\text{O}_{11}\xrightarrow{\text{Conc. H}_2\text{SO}_4} \underset{\text{sugar charcoal}}{12\text{C}} + \text{11H}_2\text{O}

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} \underset{\text{[White Anhydrous]}}{\text{CuSO}_4} + 5\text{H}_2\text{O}

(b) Sulphuric acid forms sulphate salts whereas hydrochloric acid forms chloride salts.