Solutions - CBSE Class 10 Sample Paper for 2022 Boards - Science [MCQ]

Class 10
Solutions to CBSE Sample Paper - Science Class 10

Case Base Question 

The Salt Story 

From: The New Indian Express 9 March 2021 

The salt pans in Marakkanam, a port town about 120 km from Chennai are the third largest producer of salt in Tamil Nadu. Separation of salt from water is a laborious process and the salt obtained is used as raw materials for manufacture of various sodium compounds. One such compound is Sodium hydrogen carbonate, used in baking, as an antacid and in soda acid fire extinguishers. The table shows the mass of various compounds obtained when 1litre of sea water is evaporated

Q 49 - compound in the table reacts with acids - Teachoo.jpg

Which compound in the table reacts with acids to release carbon dioxide? 

(A) NaCl 

(B) CaSO 4  

(C) CaCO 3  

(D) MgSO 4  


Answer - 

We know that

  • Acids react with Metal Carbonates and Hydrogen Carbonates to form salt, carbon dioxide and water.
  • Hence from the options, Acid will react with Calcium Carbonate (CaCO 3 ) to release Carbon Dioxide

An example of the reaction is

Calcium carbonate reacts with hydrochloric acid to form carbon dioxide gas. 

Reaction of Acid with Carbonates to release Carbon Dioxide-01.jpg


So, the correct answer is (c)

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo