Olympiad Test: Physical And Chemical Changes - 2


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


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Attempt Olympiad Test: Physical And Chemical Changes - 2 | 10 questions in 20 minutes | Mock test for Class 7 preparation | Free important questions MCQ to study Science Olympiad Class 7 for Class 7 Exam | Download free PDF with solutions
QUESTION: 1

What could be the substance Z?

Solution:

Both salt and water are neutral towards litmus. 

QUESTION: 2

How can you obtain the substance Z?

Solution:

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. 

QUESTION: 3

Which of the following could be the substance Z

Solution:
QUESTION: 4

How will the substance X behave with phenolphthalein?

Solution:
QUESTION: 5

Which of the following are not paired correctly?

Solution:

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

QUESTION: 6

Glowing of an electric bulb is a _____ change.

Solution:

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

QUESTION: 7

The formula of rust is

Solution:
QUESTION: 8

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

Solution:
QUESTION: 9

Change of limewater in presence of CO2 is

Solution:
QUESTION: 10

The crystals that are obtained after crystallization are

Solution:
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