Practice Questions CBSE - Science Class 10 (2023 Boards)

Question 1

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Question 2

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Question 3 Important

down arrow in sibling posts in Teachoo

Question 4 Important

down arrow in sibling posts in Teachoo

Question 5 Important

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Question 6

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Question 7 Important

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Question 8

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Question 9 Important

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Question 10

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Question 11

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Question 12 Important

down arrow in sibling posts in Teachoo

Question 13 Important

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Question 14

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Question 15 Important

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Question 16

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Question 17 [Assertion Reasoning] Important

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Question 18 [Assertion Reasoning] Important

down arrow in sibling posts in Teachoo

Question 19 [Assertion Reasoning] Important

down arrow in sibling posts in Teachoo

Question 20 [Assertion Reasoning]

down arrow in sibling posts in Teachoo

Question 21 (Choice 1) Important

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Question 21 (Choice 2) left arrow to signify that you are on this page You are here

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Question 22 Important

down arrow in sibling posts in Teachoo

Question 23

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Question 24 Important

down arrow in sibling posts in Teachoo

Question 25 (Choice 1)

down arrow in sibling posts in Teachoo

Question 25 (Choice 2)

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Question 26 Important

down arrow in sibling posts in Teachoo

Question 27

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Question 28 Important

down arrow in sibling posts in Teachoo

Question 29 (Choice 1)

down arrow in sibling posts in Teachoo

Question 29 (Choice 2) Important

down arrow in sibling posts in Teachoo

Question 30 Important

down arrow in sibling posts in Teachoo

Question 31 (a)

down arrow in sibling posts in Teachoo

Question 31 (b) Important

down arrow in sibling posts in Teachoo

Question 32 (Choice 1)

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Question 32 (Choice 2) Important

down arrow in sibling posts in Teachoo

Question 33 (a)

down arrow in sibling posts in Teachoo

Question 33 (b)

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Question 33 (c) Important

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Question 34 (a) - Choice 1

down arrow in sibling posts in Teachoo

Question 34 (b) - Choice 1 Important

down arrow in sibling posts in Teachoo

Question 34 (c) - Choice 1

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Question 34 (a) - Choice 2 Important

down arrow in sibling posts in Teachoo

Question 34 (b) - Choice 2]

down arrow in sibling posts in Teachoo

Question 34 (c) - Choice 2 Important

down arrow in sibling posts in Teachoo

Question 35 (a) - Choice 1 Important

down arrow in sibling posts in Teachoo

Question 35 (b) - Choice 1 Important

down arrow in sibling posts in Teachoo

Question 35 (c) - Choice 1

down arrow in sibling posts in Teachoo

Question 35 (a) - Choice 2

down arrow in sibling posts in Teachoo

Question 35 (b) - Choice 2 Important

down arrow in sibling posts in Teachoo

Question 35 (c) - Choice 2

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Question 36 Important

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

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

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

down arrow in sibling posts in Teachoo

Question 38 (a) - Choice 1 [Case Based]

down arrow in sibling posts in Teachoo

Question 38 (b) - Choice 1 [Case Based] Important

down arrow in sibling posts in Teachoo

Question 38 (c) - Choice 1 [Case Based]

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

Question 39 (b) - Choice 1 [Case Based]

down arrow in sibling posts in Teachoo

Question 39 (c) - Choice 1 [Case Based]

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

Compare the stability of a neutral sodium atom and a positive sodium ion. Justify your answer

 

Answer:

  • A positive sodium is more stable than a neutral sodium atom. 
  • An atom's stability is dependent upon whether the atom has its octet in the outer shell complete or not. 
  • Any atom reacts to form ions in order to complete their octet by gaining or losing electrons. 
  • A positive sodium ion has a complete octet of electrons in its outermost shell. It is hence more stable than the neutral atom .
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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