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Science CBSE Homework Assignments
Class 7
Physical and chemical changes
Rusting & Crystallisation
3.
Rusting and Crystallisation II
Task:
6
m.
Match the items of Column I with the items of Column II.
Column I
Column II
(a).
Large crystals
Physical change
Rust
Chemical change
Turns lime water milky
Sugar candy (Mishri)
Galvanisation
(b).
Depositing a layer of zinc on iron
Turns lime water milky
Chemical change
Rust
Physical change
Sugar candy (Mishri)
Galvanisation
(c).
Souring of milk
Turns lime water milky
Physical change
Chemical change
Rust
Sugar candy (Mishri)
Galvanisation
(d).
Carbon dioxide
Chemical change
Rust
Galvanisation
Sugar candy (Mishri)
Turns lime water milky
Physical change
(e).
Iron oxide
Sugar candy (Mishri)
Galvanisation
Rust
Turns lime water milky
Chemical change
Physical change
(f).
Dissolving common salt in water
Sugar candy (Mishri)
Galvanisation
Physical change
Rust
Chemical change
Turns lime water milky
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