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ICSE Class 10 Chemistry Question 13 of 23

Model Paper 3 — Question 13

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13
Question

Question 6(i)

Give balanced chemical equation for the following conversions :

(a) Copper sulphate to inky blue solution

(b) Methane to chloroform

Answer

Cu(OH)2+(NH4)2SO4+2NH4OH⟶[(Cu(NH3)4]SO4Tetraamminecopper (II) sulphate+4H2O\text{Cu(OH)}_2 + (\text{NH}_4)_2\text{SO}_4 + 2\text{NH}_4\text{OH} \longrightarrow \underset{\underset{\text{copper (II) sulphate}}{\text{Tetraammine}}}{[(\text{Cu(NH}_3)_4]\text{SO}_4} + 4\text{H}_2\text{O}

(b)

CH4 methane+Cl2→diffused sunlightΔCH3Clmonochloromethane+HCl\underset{\text{ methane} }{\text{CH}_4} + \text{Cl}_2 \underset{\Delta}{\xrightarrow{\text{diffused sunlight}}} \underset{\text{monochloromethane}}{\text{CH}_3\text{Cl}} + \text{HCl}

CH3Clmonochloromethane+Cl2[excess]⟶CH2Cl2dichloromethane+HCl\underset{\text{monochloromethane}}{\text{CH}_3\text{Cl}} + \underset{\text{[excess]}}{\text{Cl}_2} \longrightarrow \underset{\text{dichloromethane}}{\text{CH}_2\text{Cl}_2} + \text{HCl}

CH2Cl2dichloromethane+Cl2⟶CHCl3trichloromethane or chloroform+HCl\underset{\text{dichloromethane}}{\text{CH}_2\text{Cl}_2} + \text{Cl}_2 \longrightarrow \underset{\text{trichloromethane or chloroform}}{\text{CHCl}_3}+ \text{HCl}