give me the answer of this question please
only part b
chapter- Physical and Chemical change in chemistry
Answers
(a) When Platinum gets heated, it changes color. When cooled it retains its earlier color and it does not react easily with oxygen in the air. Magnesium reacts with Oxygen in the air and forms magnesium oxide which cannot be undone.
(b) Zinc nitrate dissolves in water and hence is a physical change. The reaction between zinc and nitric acid produces H2 gas which gets oxidized causing a chemical change.
(c) Iron rust has a different composition from iron and has new properties, which cannot be reversed. Magnetization of iron is a temporary change, which does not change the composition of iron but only physical properties.
Answer:
a) Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.Magnesium reacts with Oxygen in the air and forms magnesium oxide which cannot be undone.
b) Zinc nitrate dissolves in water and hence is a physical change. The reaction between zinc and nitric acid produces H2 gas which gets oxidized causing a chemical change.
c) Rusting of iron is a chemical change because a new substance iron oxide is formed. The presence of oxygen and water or water vapour is essential for rusting.
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