Practice Questions CBSE - Science Class 10 (2023 Boards)

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Question 17 [Assertion Reasoning] Important

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Question 21 (Choice 1) Important

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Question 31 (a)

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Question 34 (a) - Choice 1

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Question 37 (a) - Choice 1 [Case Based]

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Question 37 (b) ii - Choice 2 [Case Based] Important

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Question 39 (d) - Choice 1 [Case Based] Important

Question 39 (d) - Choice 2 [Case Based] Important

Identify the endothermic reaction(s) among the following:

Identify the endothermic reaction - Teachoo.jpg

A. only P

B. only S

C. only Q and R

D. only P and S

 

Answer:

An Endothermic reaction is one where we need to supply energy for the reaction to take place. 

Exothermic Reactions give out energy when the reactions take place.

P. This reaction is Photosynthesis

  • Photosynthesis is an endothermic reaction as it requires energy (in the form of sunlight) to proceed. 

Reaction for Photosynthesis -teachoo.jpg

Q. This is a reaction between an acidic (HCl) and a basic (Na2CO3) compound. 

  • This type of reaction is known as neutralisation reaction.
  • A neutralisation reaction is always exothermic in nature. 
  • It releases heat , and forms water and salt.

Neutralization Reaction - teachoo.jpg

R . C6H12O6 is the chemical formula for Glucose

  • When oxygen is added to glucose, it breaks down into Carbon Dioxide and Water and releases energy . It is therefore Exothermic.
  • This energy is what we use to do everyday tasks. 
  • The reaction is called Aerobic Respiration

Breakdown of Glucose inside cell-01.jpg

S. This is a decomposition reaction. 

  • A decomposition reaction is always endothermic in nature as we require extra energy to break bonds.

Queation 3 - Reaction - teachoo.jpg

Therefore, the correct answer is D.

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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