Which of the following processes correspond to a chemical change?

Galvanisation of an iron door

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Formation of a bluish-green coat over a copper vessel

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Crystallisation of copper sulphate

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Blowing off a fuse

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Solution

The correct option is B Formation of a bluish-green coat over a copper vessel

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Question 11
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change–A) then it burns (Change–B). The following statements pertain to these changes. Choose the correct one.
Which of the processes is a chemical change?
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(ii) Process – B is a chemical change.
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.

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