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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] medium exam-ready
Assertion (A): Saponification is the process used in the preparation of soap. Reason (R): When an ester is treated with sodium hydroxide, it gives back the alcohol and the sodium salt of the carboxylic acid.
  1. A Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  2. B Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
  3. C Assertion (A) is true, but Reason (R) is false.
  4. D Assertion (A) is false, but Reason (R) is true.
Generated by claude-sonnet-4-6 · 2026-06-26 01:07 · grounding rag
Model Answer

Option A — Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Saponification is the alkaline hydrolysis of an ester with NaOH, giving alcohol and sodium salt of carboxylic acid; this reaction is used in soap preparation.

Source: Chapter 4, Section 4.4.2 (Properties of Ethanoic Acid)

Explanation

The textbook explicitly states: "On treating with sodium hydroxide…the ester is converted back to alcohol and sodium salt of carboxylic acid. This reaction is known as saponification because it is used in the preparation of soap." So the Reason directly and correctly explains the Assertion — choose Option A.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.