CBSE Class 10 Sample Paper Science Solution - For 2024 Boards

Question 1

Question 2 Important

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Question 17 [Assertion Reasoning] Important

Question 18 [Assertion Reasoning]

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Question 23 (Choice 1) Important

Question 23 (Choice 2)

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Question 25 (Choice 1)

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Question 28 (Choice 1) Important

Question 28 (Choice 2)

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Question 31 (i) Important

Question 31 (ii)

Question 31 (iii) Important

Question 32 (i)

Question 32 (ii) Important

Question 33 Important

Question 34 (Choice 1A)

Question 34 (Choice 1B) Important

Question 34 (Choice 2) You are here

Question 35 (Choice 1)

Question 35 (Choice 2A) Important

Question 35 (Choice 2B)

Question 36 (Choice 1) Important

Question 36 (Choice 2) Important

Question 37 (a) [Case Based]

Question 37 (b) - Choice 1 [Case Based] Important

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

Question 38 (a) [Case Based] Important

Question 38 (b) [Case Based]

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

Question 38 (c) - Choice 2 [Case Based]

Question 39 (a) [Case Based]

Question 39 (b) [Case Based] Important

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

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

Raina while doing certain reactions observed that heating of substance ‘X’ with vinegar like smell with a substance ‘Y’ (which is used as an industrial solvent) in presence of conc.

Sulphuric acid on a water bath gives a sweet-smelling liquid ‘Z’ having molecular formula C 4 H 8 O 2 . When heated with caustic soda (NaOH), ‘Z’ gives back the sodium salt of and the compound ‘Y’.

Identify ‘X’, ‘Y’, and ‘Z’. Illustrate the changes with the help of suitable chemical equations

 

Answer:

Vinegar like smelling substance ‘X’ is acetic acid (CH 3 COOH)

The industrial solvent ‘Y’ is Ethanol (C 2 H 5 OH)

 When both X and Y react in the presence of concentrated H 2 SO 4 , esterification reaction occurs:

The sweet smelling ester ‘Z’ that is formed is CH 3 COOC 2 H 5 (ethyl ethanoate)

CH 3 COOC 2 H 5 reacts with NaOH as:

This is called saponification reaction

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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