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

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Solutions to CBSE Sample Paper - Science Class 10

Question 25 - Solutions - CBSE Class 10 Sample Paper for 2022 Boards - Science [MCQ] - Solutions to CBSE Sample Paper - Science Class 10

Last updated at April 16, 2024 by

Q 25 - type of reactions occurring in step 1 and step 2 - Teachoo.jpg

Identify the correct option from the given table which represents the type of reactions occurring in step 1 and step 2.

Q 25 - type 2 of reactions occurring in step 1 and step 2 - Teachoo.jpg

Answer - 

Heating lime stone-01.jpg

  • When limestone is heated, it absorbs heat (endothermic) and decomposes to form calcium oxide . This is indicated by an orange glow as the limestone is heated.
  • The formation of calcium hydroxide, Ca(OH) 2 , i.e, slaked lime, when water is added to lime (CaO), the reaction is exothermic . 

Reactions when Limestone is heated, and then water is added - Teachoo.jpg

So, the correct answer is (c)  

 

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Maninder Singh

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