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NCERT Class 10 Science Carbon and its Compounds: In-text questions (page 72) Solutions
AI-written, checked on 23 Oct 2026
Solutions written by Shishya, checked — not the board's official answers
Step-by-step working for every question of In-text questions (page 72) in NCERT's Class 10 Science book, chapter “Carbon and its Compounds”, written by Shishya. Each question is in our own short words; open the NCERT chapter for the exact wording and figures.
How these were checked: the solutions were drafted with AI and then read and corrected on 23 Oct 2026. Every numerical final answer is recomputed from the question's own numbers by a calculator check that runs before each release; proofs and explanations were read, not machine-checked. The NCERT textbook is the authority — if something here disagrees with it, follow the book.
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In-text (page 72) Q1
Why is the conversion of ethanol to ethanoic acid an oxidation reaction?
- Ethanol has the molecular formula C₂H₅OH, which can be written as CH₃CH₂OH.
- Ethanoic acid has the molecular formula CH₃COOH.
- In this conversion, two hydrogen atoms are removed from the ethanol molecule.
- Alternatively, an oxygen atom is added to the carbon chain to form the carboxyl group.
- The addition of oxygen or removal of hydrogen from a substance is defined as oxidation.
- Therefore, the chemical change from ethanol to ethanoic acid is an oxidation reaction.
Answer: The conversion is an oxidation reaction because oxygen is added or hydrogen is removed from ethanol.
In-text (page 72) Q2
A mixture of oxygen and ethyne is burnt for welding. Why is a mixture of ethyne and air not used?
- In air (only about one-fifth oxygen), ethyne does not get enough oxygen and burns incompletely with a sooty flame.
- This incomplete burning produces carbon particles that appear as soot and smoke.
- The soot deposits on the metal being welded, which makes the weld weak and impure.
- In pure oxygen ethyne burns completely and the flame is hot enough (about 3000 °C) to melt metals for welding.
- Therefore, a mixture of ethyne and air is not used for welding.
Answer: Ethyne burnt with air burns incompletely and its flame is not hot enough for welding (and is sooty); with pure oxygen it burns completely, giving a very hot, clean flame.
Other exercises in this chapter
- In-text questions (page 61) — 2 questions
- In-text questions (page 68) — 5 questions
- In-text questions (page 74) — 2 questions
- In-text questions (page 76) — 2 questions
- End-of-chapter exercises — 15 questions
← Carbon and its Compounds: notes, practice and all exercises
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