Which of the following changes is a chemical change?

Formation of curd from milk

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Dissolution of sugar in water

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Shredding a sheet of paper into bits

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Melting of an ice cube

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Solution

The correct option is A
Formation of curd from milk

The formation of curd from milk is a chemical change, as the enzymes secreted by the bacteria lactobacillus converts milk into curd.

The dissolution of sugar in water, shredding a piece of paper and melting of ice are examples of a physical change as no chemical reaction is involved in the processes.

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Similar questions

Q. Which of these is not a chemical change?
(a) changing of ice to water
(b) changing of milk to curd
(c) rusting of iron
(d) both a and b

Q. Formation of curd from milk is the example of
(a) slow
(b) chemical change
(c) periodic change
(d) physical change

Q. Classify the following into slow and fast changes:
(i) Spinning of top
(ii) Formation of day and night
(iii) Formation of curd from milk
(iv) Change of season
(v) Making curd from milk by adding lemon juice.

Question 11

Can we reverse the following changes? If yes, suggest the name of the method.
Water into water vapour
Water vapour into water
Ice into water
Curd into milk

Question 2:
Can we reverse the following changes? If yes, suggest the name of the method.

(a) Water into water vapour

(b) Water vapour into water

(c) Ice into water

(d) Curd into milk

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