Practice Questions CBSE - Science Class 10 (2023 Boards)

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Question 4 Important You are here

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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 37 (a) - Choice 1 [Case Based]

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

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

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

Ashok has written the following reactions to show how metals can be obtained from their ores. 

P) 2 Fe 2 O 3 + 3C --------> 4 Fe + 3 CO 2  

Q) Na 2 O + C --------> 2 Na + CO 

R) ZnO + C --------> Zn + CO 

S) CuO + C -----------> Cu + CO2 

Identify the INCORRECT reaction(s) among them.

A. only P

B. only Q

C. only P and R

D. only Q, R or S

 

Answer:

P. This equation shows how Iron is obtained from its ore. 

This reaction takes place in the blast furnace .

Queation4 - Reaction - teachoo.jpg

Q. Na2O + C --------> 2 Na + CO 

Sodium is a highly reactive metal. 

Metals like Sodium, Potassium are extracted using electrolytic reduction of their metal chlorides

electrolytic reduction - teachoo.jpg

R. ZnO + C --------> Zn + CO

Question 4 - reduction - teachoo.jpg

S. CuO + C -----------> Cu + CO 2

Question 4 - Reductions - teachoo.jpg

  • Zn and C u are both moderately reactive metals. 
  • Both can be obtained from their ores by reduction by Copper .

Therefore, the correct answer is B .

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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