QIV. Match the following:-
1. Physical change
2. Separating chalk powder from water
3. Ammonium chloride
4. Respiration
5. Chemical change
formation of curd
Oxygen
filtration
Evaporation
Sublimation
Answers
Explanation:
a) Evaporation of petrol is a physical change as no new product is formed only physical state changes.
b) Burning of Liquefaction of petroleum gas is a chemical change as new products are formed.
c) Heating iron rod to red hot is a physical change as no new product is formed; only temporary change (increase in temperature) occurs.
d) Curdling of milk is a chemical change as a new product in the form of curd is formed whose chemical composition is different from milk.
e) Sublimation of ammonium chloride is a physical process in which solid-state changes to gaseous one.
Hence the correct option is D.
a) Evaporation of petrol is a physical change as no new product is formed only physical state changes.
b) Burning of Liquefaction of petroleum gas is a chemical change as new products are formed.
c) Heating iron rod to red hot is a physical change as no new product is formed; only temporary change (increase in temperature) occurs.
d) Curdling of milk is a chemical change as a new product in the form of curd is formed whose chemical composition is different from milk.
e) Sublimation of ammonium chloride is a physical process in which solid-state changes to gaseous one.
Hence the correct option is D.