CBSE Class 10 Sample Paper Science Solution - For 2023 Boards

Class 10
Solutions to CBSE Sample Paper - Science Class 10

(a) What is the role of concentrated Sulphuric acid when it is heated with Ethanol at 443 K. Give the reaction involved.

(b) Reshu by mistake forgot to label the two test tubes containing Ethanol and Ethanoic acid. Suggest an experiment to identify the substances correctly? Illustrate the reactions with the help of chemical equations



(a) Sulphuric acid acts as a dehydrating agent

  • This means it removes Water from the compound.

Dehydration of Alcohol - Teachoo.jpg


  • We can differentiate ethanol and ethanoic acid by r eaction of the samples with sodium carbonate/ bi carbonate ( 1M ).
  • Ethanol will not react whereas ethanoic acid will give brisk effervescence (fizz, bubbles).

The corresponding reactions are given as:

  • 2CH 3 COOH + Na 2 CO 3 → 2CH 3 COONa + H 2 O+ CO 2  
  • CH 3 COOH + NaHCO₃ → CH 3 COONa + H 2 O + CO 2

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo