Question

A change may occur by

by heating a substance

by mixing it with some other substance

both of these

none of these




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Answer 1

A change may occur -

Answer - by Heating or mixing with some other substance.

Answer 2

Answer:

Both of these

Explanation:

For eg- If we heat ice, it turns into water

For eg- If we add chromium in liquid sodium

so, both of these is correct