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Chemical Change

If two substa...

Question

If two substances are brought in contact, it will result in
(a) a physical change only.
(b) a chemical change only.
(c) either a physical change or a chemical change, depending on the conditions.
(d) a chemical change if they are heated together otherwise, a physical change.

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Solution

(c) either a physical change or a chemical change, depending on the conditions.
When two substances are mixed together, it can result either in a physical or chemical change. This depends on the substances that are mixed and also on the conditions.

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