In pressure-kerosene stove, (i) We pump kerosene and convert it into vapours. (ii) The vapours are then ignited. Which of the following is true about the above statements ?
(1) (i) is a chemical change; (ii) is a physical change
(2) (i) is a physical change; (ii) is a chemical change
(3) (i) and (ii) both are physical changes
(4) (i) and (ii) both are chemical changes
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this question answer is 2
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answer : option (2) (i) physical change (ii) chemical change
explanation : In pressure-kerosene stove, we pump kerosene and covert it into vapours. involve the change in the physical state only (e.g., from liquid to vapours). no substance are formed. so, this is a physical change.
During ignition of vapours, a lot of heat is evolved and new substance are formed. Therefore it is a chemical change.
hence, option (b) is correct.
explanation : In pressure-kerosene stove, we pump kerosene and covert it into vapours. involve the change in the physical state only (e.g., from liquid to vapours). no substance are formed. so, this is a physical change.
During ignition of vapours, a lot of heat is evolved and new substance are formed. Therefore it is a chemical change.
hence, option (b) is correct.
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