Practice Questions CBSE - Science Class 10 (2023 Boards)

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Question 17 [Assertion Reasoning] Important

Question 18 [Assertion Reasoning] Important

Question 19 [Assertion Reasoning] Important

Question 20 [Assertion Reasoning]

Question 21 (Choice 1) Important

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Question 25 (Choice 1)

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Question 29 (Choice 1)

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Question 31 (a)

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Question 32 (Choice 1)

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Question 33 (a)

Question 33 (b)

Question 33 (c) Important

Question 34 (a) - Choice 1

Question 34 (b) - Choice 1 Important

Question 34 (c) - Choice 1

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Question 34 (b) - Choice 2]

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Question 35 (a) - Choice 1 Important

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Question 35 (c) - Choice 2

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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

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

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

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

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

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

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

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

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

The following reactions are carried out in open vessels.

The following reactions are carried - Teachoo.jpg

Which of the following correctly shows if the weight of the reaction vessel and contents increases, decreases or remains the same after the reaction as compared to before the reaction?

The following reactions- Teachoo.jpg

A. A

B. B

C. C

D. D

 

Answer:

The reactions are being carried out in an open vessel

This implies two things:

  • The reactants can react with gases in the atmosphere, reactants whose weight does not contribute to the total weight and,
  • The gaseous products will be released back into the atmosphere . The product side would hence weigh less (minus the weight of the gases).

In reaction P , since the gas is on the reactant side, the reactants would weigh less than the products. Hence, weight increases.

In reaction Q , there are only solid and aqueous state reactants and products. These contribute to the weight on both sides. Hence, weight remains the same

In reaction R , the gas is on the products side. The gaseous Sulphur Trioxide is released 

into the atmosphere and hence does not contribute to the weight. This leads to a decrease in weight.

GAS MUST BE COLLECTED IN A CLOSED VESSEL TO ADD TO WEIGHT - 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