Warming ammonium chloride with sodium hydroxide in a test tube is an example of:

closed system

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isolated system

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open system

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none of these

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Solution

The correct option is B open system
When we are warming ammonium chloride with sodium hydroxide in a test tube, there is exchange of heat as well as mass between system and surrounding. Mass is transferred from the open end of the test tube due to evaporation. Also heat is being exchanged through the walls of test tube.

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