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CBSE Class 10 Science Question 37 of 45

Solved 2024 Sample Question Paper CBSE Class 10 Science — Question 1

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Question

Question 34(a)

(a) Rehmat classified the reaction between Methane and Chlorine in presence of sunlight as a substitution reaction. Support Rehmat's view with suitable justification and illustrate the reaction with the help of a balanced chemical equation.

(b) Chlorine gas was prepared using electrolysis of brine solution. Write the chemical equation to represent the change. Identify the other products formed in the process and give one application of each.

Answer

(a) Rehmat's observation is correct as the hydrogen atoms are substituted by hetero atom i.e., Cl

CH4 + Cl2 →In presence of sunlight{\xrightarrow{\text{In presence of sunlight}}} CH3Cl + HCl

(b) 2NaCl (aq) + 2H2O (l) ⟶ 2NaOH (aq) + Cl2 (g) + H2 (g)

  • NaCl ⟶ Na+ + Cl-

  • 2Cl- ⟶ Cl2 + 2e- [At anode]

  • H2O ⟶ H+ + OH-

  • 2H+ + 2e- ⟶ H2 [At cathode]

  • Na+ + OH- ⟶ NaOH

Other products formed are sodium hydroxide and hydrogen gas.

Uses of Sodium hydroxide:

  • Degreasing of metals
  • Preparation of soaps and detergents
  • Paper making
  • Artificial fibres

Uses of Hydrogen:

  • Fuel
  • Hydrogenation of vegetable oil to make vanaspati ghee
  • Manufacture of ammonia for fertilizer