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Olympiad Test: Physical And Chemical Changes - 2


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10 Questions MCQ Test Science Olympiad Class 7 | Olympiad Test: Physical And Chemical Changes - 2

Olympiad Test: Physical And Chemical Changes - 2 for Class 7 2022 is part of Science Olympiad Class 7 preparation. The Olympiad Test: Physical And Chemical Changes - 2 questions and answers have been prepared according to the Class 7 exam syllabus.The Olympiad Test: Physical And Chemical Changes - 2 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 - 2 below.
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Olympiad Test: Physical And Chemical Changes - 2 - Question 1

What could be the substance Z?

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 2 - Question 1

Both salt and water are neutral towards litmus. 

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

How can you obtain the substance Z?

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 2 - Question 2

Z is either water or salt, both of which can be obtained from the reaction between acid and a salt. Since X is a base and Y is an acid, Z can be obtained from the reaction between X and Y. 

Olympiad Test: Physical And Chemical Changes - 2 - Question 3

Which of the following could be the substance Z

Olympiad Test: Physical And Chemical Changes - 2 - Question 4

How will the substance X behave with phenolphthalein?

Olympiad Test: Physical And Chemical Changes - 2 - Question 5

Which of the following are not paired correctly?

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 2 - Question 5

The chemical name of slaked lime is calcium hydroxide and calcium oxide is the chemical name of quick lime. 

Olympiad Test: Physical And Chemical Changes - 2 - Question 6

Glowing of an electric bulb is a _____ change.

Detailed Solution for Olympiad Test: Physical And Chemical Changes - 2 - Question 6

Since, no new substances are formed in this change, it is a physical change. 

Olympiad Test: Physical And Chemical Changes - 2 - Question 7

The formula of rust is

Olympiad Test: Physical And Chemical Changes - 2 - Question 8

The process of separating a pure substance in the form of crystals from the hot saturated solution by cooling is called

Olympiad Test: Physical And Chemical Changes - 2 - Question 9

Change of limewater in presence of CO2 is

Olympiad Test: Physical And Chemical Changes - 2 - Question 10

The crystals that are obtained after crystallization are

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