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Agrani from St. Karen's Secondary School, Patna
Subject :Sam    Class : Sample

Which one of the following is true for all chemical reactions?

AThere is a change in volume
BHeat is evolved
CChemical bonds are broken or formed
DThere is a change in mass


I DID NOT UNDERSTAND THIS

Ans 1:

Pulkit Gupta from Maxfort School, New Delhi
Class : Class 7
the answer should be B as heat is evolved in every chemical change.

Ans 2:

Akhilesh Kancharla from International Educational Academy, Hyderabad
Class : Class 7

Ans 3:

ishita gayen from Julien day school, Kalyani
Class : Class 7
The answer should be C because in chemical reaction the bonds of atoms break in order to form the products

Ans 4:

Aniket kumar from kendriya vidyalaya, Delhi
Class : Class 8

Ans 5:

Kashish Kathuria from Delhi Public School, Bangalore
Class : Class 9
PULKIT IS RIGHT THE ANSWER IS B

Ans 6:

Mradul from Modern public school bhiwadi, Bhiwadi
Class : Class 7

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