Question

3. Souring of milk is
(a) desirable change
(c) irreversilde change
(b) periodic change
(d) reversible change
(b) contract
(d) catch fire
4. On heating, metals
(a) expand
(c) are not affected
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Answer 1

Answer:

1. SOURING OF MILK IS A CHEMICAL CHANGE.
2. ON HEATING , METALS EXPAND