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Subject :NSO    Class : Class 6

When a little bit of curd is added to milk and it is left undisturbed for sometime, the milk changes into curd. It is an example of

(A) Fast chemical change

(B) Fast physical change

(C) Slow chemical change

(D) Slow physical change.
can you explain how is it a slow chemical change as its written after sometime

Ans 1:

Class : Class 8
slow chemical change

Ans 2:

Class : Class 9
It is a slow chemical change because the change happens slowly and you can not turn curd back into milk

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