Which among the following is not a chemical change?
Decomposition of water into hydrogen and oxygen
Magnetizing a compass needle.
Rusting of iron.
Fermentation of substances
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magnetizing a compass needle is not a chemical change because it will be demagnetized after sometime
note: chemical change is permanent
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Answer:
The synthesis (forming) of water (H2O) fromhydrogen gas (H2) and oxygen gas (O2) is another example of chemical change. ... Thechemical bonds between O in O2 and between H in H2 are broken and new bonds between H and O (to form H2O) are formed.
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