Question

Choose the odd one out:-
a. Evaporation b. Condensation c. Refining d. Melting
a. Folding of paper b. Burning of candle c. Souring of milk d. Sublimation
a. Growth of plants b. Cutting of trees c. Ripening of fruits d. Stretching of rubber band
a. Expansion b. Contraction c. Freezing d. Rusting
a. Making coffee b. Roasting c. Melting of chocolate d. Baking cake

Answer 1

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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.

Answer 2

Answer:

Refining

folding a paper

Stretching of rubber band

rusting

Melting of chocolate