MEDIUM
7th CBSE
IMPORTANT
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What kind of reaction is burning of wax?

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Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>ORAL QUESTIONS>Q 1
Two chemicals in solution form react, forming an insoluble solid that settles down. What is the settled solid known as? (Precipitate / Solute)
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>ORAL QUESTIONS>Q 2
In which reaction will heat be released–exothermic reaction or endothermic reaction?
 
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>ORAL QUESTIONS>Q 3
Nitrogen + Oxygen → Nitrogen dioxide. What type of reaction is this? (Decomposition/ Combination)
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>ORAL QUESTIONS>Q 4
What is the characteristic of the reaction:
MN + PQ → MQ + PN
What is the general name given to such reactions? (Double displacement reaction/ Combination reaction/ Decomposition reaction)
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>ORAL QUESTIONS>Q 5
Which of the following is true for a substance that is oxidized in a chemical reaction–oxygen is added to it, hydrogen is removed from it, or both are true?
 
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>ORAL QUESTIONS>Q 1
The atoms or molecules of a solid are always arranged in a regular pattern. Do you agree? Give reasons.
 
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>ORAL QUESTIONS>Q 2
You are given a solution of a solid and a liquid. How can you obtain the solid from it?
 
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>ORAL QUESTIONS>Q 3
What is the process of obtaining crystals of a substance from its solution in water called?