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Olympiad Test: Physical And Chemical Changes - 1


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20 Questions MCQ Test Science Olympiad Class 7 | Olympiad Test: Physical And Chemical Changes - 1

Olympiad Test: Physical And Chemical Changes - 1 for Class 7 2022 is part of Science Olympiad Class 7 preparation. The Olympiad Test: Physical And Chemical Changes - 1 questions and answers have been prepared according to the Class 7 exam syllabus.The Olympiad Test: Physical And Chemical Changes - 1 MCQs are made for Class 7 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Physical And Chemical Changes - 1 below.
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Olympiad Test: Physical And Chemical Changes - 1 - Question 1

Burning of wood is a ______ change.

Olympiad Test: Physical And Chemical Changes - 1 - Question 2

Neutralization change is a

Olympiad Test: Physical And Chemical Changes - 1 - Question 3

What is the main cause of acid rain?

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 1 - Question 3

Acid rain occurs mainly because of carbon dioxide, sulphur dioxide and nitrogen dioxide which are all pollutants. 

Olympiad Test: Physical And Chemical Changes - 1 - Question 4

Some pieces of chalk were taken and mixed with water. In this change, how many new substances are formed?

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 1 - Question 4

This is a physical change even though the characteristics of this mixture is different from the original substances can retain their properties and can be get back easily. 

Olympiad Test: Physical And Chemical Changes - 1 - Question 5

Two changes are stated below
(i) a piece of magnesium gives out bright flames when burnt.
(ii) a piece of iron glows red when heated strongly.

Q. Which of these is a chemical change?

Olympiad Test: Physical And Chemical Changes - 1 - Question 6

Which of the following changes is not a chemical change?

Olympiad Test: Physical And Chemical Changes - 1 - Question 7

Which of the following Venn diagrams shows the relationship between changes correctly?

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 1 - Question 7

All chemical changes are irreversible and the original substances can not be obtained. 

Olympiad Test: Physical And Chemical Changes - 1 - Question 8

Which one is a physical change?

Olympiad Test: Physical And Chemical Changes - 1 - Question 9

When iron pieces are added to a blue colour copper sulphate solution, the colour of copper sulphate changes to

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 1 - Question 9

When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

Olympiad Test: Physical And Chemical Changes - 1 - Question 10

The gas released when vinegar is mixed with baking soda is

Olympiad Test: Physical And Chemical Changes - 1 - Question 11

Which of the following is not a physical change?

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 1 - Question 11

No new substances are formed in all these changes. 

Olympiad Test: Physical And Chemical Changes - 1 - Question 12

Manisha took a little bit of soil from her garden and mixed it with water. When she dipped blue litmus in it, the litmus turned red. By adding which of following to her garden will she get better plant growth?

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 1 - Question 12

The soil is acidic and should be neutralized by adding slaked lime (calcium hydroxide) which is a base. 

Olympiad Test: Physical And Chemical Changes - 1 - Question 13

Three substances given below are kept in the open for a few days and some changes were observed.

Which of th e substances will show chemical changes?

Olympiad Test: Physical And Chemical Changes - 1 - Question 14

Pooja took a candle in a vessel and heated the vessel. Even though the candle did not burn, it changed its shape and state. What kind of change is this?

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 1 - Question 14

The candle started melting, but since no new substance was formed it is a physical change. 

Olympiad Test: Physical And Chemical Changes - 1 - Question 15

The product formed when Mg is burnt in air is:

Olympiad Test: Physical And Chemical Changes - 1 - Question 16

Rusting takes place in

Olympiad Test: Physical And Chemical Changes - 1 - Question 17

Which of the following is an antacid?

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 1 - Question 17

Magnesium hydroxide or Mg(OH)2 is an antacid. It is also known as milk of magnesia. It neutralizes excess HCl (acid) present in stomach  

Olympiad Test: Physical And Chemical Changes - 1 - Question 18

Adding sodium chloride to water is a

Three different substances were taken and tested with litmus paper. The results are given below. Based on the results answer the questions 19 to 24.

Olympiad Test: Physical And Chemical Changes - 1 - Question 19

What could be the substance X?

Olympiad Test: Physical And Chemical Changes - 1 - Question 20

What could be the substance Y?

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