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Subjects
Science CBSE
Class 7
Physical and chemical changes
Textbook questions
28.
NCERT Exemplar XIII
Exercise condition:
4
m.
Write word equations for two chemical reactions with the help of materials given in the box.
Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water.
(i)
.
Iron
Copper
Lime
+ Air + Water →
Iron oxide
Iron hydroxide
Copper oxide
.
(ii)
.
Copper oxide
Iron hydroxide
Copper sulphate
+ Iron →
Iron sulphate
Iron hydroxide
Copper sulphate
+ Copper.
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