The gas we use in the kitchen is called | Class 7 Science Chapter Physical and Chemical Changes, Physical and Chemical Changes NCERT Solutions

Question:

The gas we use in the kitchen is called liquified petroleum gas (LPG). In the cylinder it exist 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.

(i) Process – A is a chemical change.
(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.

Answer:

(ii) Process - B is a chemical change

LPG is present in liquid form in the cylinder and when it comes in the contact of environment it converts into gaseous form which is a physical change. But When it burns, it converts in the from of heat and light, then this is a chemical change; this cannot be reversed. 


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Welcome to the NCERT Solutions for Class 7 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 11: The gas we use in the kitchen is called liquified petroleum gas (LPG). In the cylinder it exist as a....