10th Standard CBSE Syllabus & Materials

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CBSE 10th Standard Science Subject Chemical Reactions and Equations HOT Questions 1 Mark Questions 2021

Published on: 29/05/2021

QB365 Provides the HOT Question Papers for Class 10 Science, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

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Std: 10th Standard CBSE - Science

chapter: - HOT Questions

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Questions:

Generic 2

5 x 2 = 10

Ashok wanted his house to white washed. He bought 10kg quick lime from market and dissolved it in 30 liters of water. On adding lime to water he noticed that bubbles were produced and the solution becomes hot. Give reason and name the product formed.

Which term is used to indicate the development of unpleasant smell and taste in butter and oil containing food?

The decomposition of vegetable matter in to compost is an example of what type of reaction?

People living in coastal areas use plastic articles than iron articles for their day to day activities. Why?

What happens to idli dough when it is kept at room temperature on a summer day?

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Answers Key:

Generic 2

5 x 2 = 10

It happen because when we react quick lime with water it releases heat energy and due to this it produces bubbles in water.
Product is
CaO + H₂O → Ca(OH)₂+ heat

Oxidation

Exothermic reaction.

High humidity

Anaerobic respiration