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प्रश्न
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
उत्तर
Addition of sodium chloride to water is considered a physical change because it does not form any new substance. but when the addition of dilute sulphuric acid is added to zinc. They forms zinc-sulphate hence it is considered as a chemical change.
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