(9) which of the following changes takes place when some other
substance is mixed with the given substance? A. heating of iron. B. Curdling of milk.
C. The grinding wheat intoflour. D. folding a paper to make a paper boat
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Example: If iron and sulphur are mixed, no chemical change occurs. But when the mixture is heated, it glows after some time and a black substance is formed which is different from iron and sulphur. So, heating a ...
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B.Curdling of milk.
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