State why addition of sodium chloride to water is considered a physical change,while addition of dilute sulphuric acid to zinc is considered as chemical change.

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Solution

Sodium chloride in water is a physical change because no chemical change is taking place

Dilute Sulphuric acid with Zinc is a chemical reaction.In this reaction Zinc sulphate and Hydrogen gas is formed

Zn + H2SO4 ---> ZnSO4 + H2

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State why addition of sodium chloride to water is considered a physical change,while addition of dilute sulphuric acid to zinc is considered as chemical change.

Sodium chloride in water is a physical change because no chemical change is taking place Dilute Sulphuric acid with Zinc is a chemical reaction.In this reaction Zinc sulphate and Hydrogen gas is formed Zn + H2SO4 ---> ZnSO4 + H2

Sodium chloride in water is a physical change because no chemical change is taking place

Dilute Sulphuric acid with Zinc is a chemical reaction.In this reaction Zinc sulphate and Hydrogen gas is formed

Zn + H2SO4 ---> ZnSO4 + H2