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User from School
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:

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

Ans 2:

from ,
Class :

Ans 3:

from ,
Class :
the answer should be B as heat is evolved in every chemical change.

Ans 4:

from ,
Class :

Ans 5:

from ,
Class :
The answer should be C because in chemical reaction the bonds of atoms break in order to form the products

Ans 6:

Aniket kumar from kendriya vidyalaya, Delhi
Class : Class 8

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