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:
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Ans 3:
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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:
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Kashish Kathuria
from
Delhi Public School, Bangalore
Class : Class 9
PULKIT IS RIGHT THE ANSWER IS B
Ans 5:
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Pulkit Gupta
from
Maxfort School, New Delhi
Class : Class 7
the answer should be B as heat is evolved in every chemical change.