Answer:
statement second and third are both corect
Explanation:
When iron(grey) reacts with sulfur(yellow) chemical change takes place in which iron sulfide is formed which black in color.
Fe(s) + S(s)\rightarrow FeS(s)Fe(s)+S(s)→ FeS(s)
When we heat copper sulfate-pentahydrate(blue) ,water molecule present in its crystal will get evaporated and it will become an anhydrous copper sulfate which will be white in color.
CuSO_{4}.5H_{2}O(s)\overset{heat}{\rightarrow} CuSO_{4}(s)+5H_2O(g)CuSO
4
.5H
2
O(s)
→
heat
CuSO
4
(s)+5H
2
O(g)
So, in both the reactions chang
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