Question 17 [Assertion Reasoning] - Practice Questions CBSE - Science Class 10 (2023 Boards) - Solutions to CBSE Sample Paper - Science Class 10

Last updated at April 16, 2024 by Teachoo

Assertion (A): A white washed wall develops a coating of calcium carbonate after a few days.

Reason (R): Calcium oxide on the wall reacts slowly with carbon dioxide in the air.

Answer:

Slaked lime [Ca(OH) ₂ ] is used to white wash walls.
When it is exposed to air, it reacts with the Carbon Dioxide to form Calcium Carbonate which gives the walls white colour .

Queation 17 - Reaction - teachoo.jpg

Since it is Calcium Hydroxide and not Calcium Oxide reacting,

The correct answer is C .

A is true but R is false.

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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

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