1. Give an example of a chemical reaction:
a) where a gas is evolved
b) where there is a change in the colour of a solution
c) where there is formation of insoluble precipitates
d) where heat energy in given out
e) where heat energy in absorbed.
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Answer:
1=Hcl+Zn=Zncl2+h2
2=Cu +Co2=cuCo3 in this it changes its colour from reddish brown to green
3=AgNo3×Nacl=Gcl+NaNo3