Q1
1 markMCQSection A

In which one of the following situations a chemical reaction does not occur?

Chemical Reactions and Equations
Chemical Reactions

Options

(a)Milk is left open at room temperature during summer
(b)Grapes get fermented
(c)An iron nail is left exposed to humid atmosphere
(d)Melting of glaciers
Official Answer

Melting of glaciers

meltingglaciersphysical change

Marking Scheme

  • 11 mark

Hint

Identify the situation that does not involve a chemical change.

Quick Oral Answer

Melting of glaciers is a physical change, not a chemical reaction.

Analysis & Explanation

The question requires the student to identify a situation where a chemical reaction does not occur. The correct answer is melting of glaciers, as it is a physical change and not a chemical reaction. The other options involve chemical reactions, such as spoilage of milk, fermentation of grapes, and rusting of an iron nail.

Common Mistakes

  1. 1Confusing physical and chemical changes

Interesting Facts

Chemical reactions involve the transformation of one substance into another, whereas physical changes do not.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2025?

This question carries 1 mark in the CBSE Class 10 Science 2025 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Chemical Reactions and Equations" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Chemical Reactions" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2025 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2025 paper.