When washing soda is exposed to hot atmosphere for a long time, it:

Question

When washing soda is exposed to hot atmosphere for a long time, it: — Exam MCQ

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C. loses water molecules and becomes powdery — When washing soda (sodium carbonate decahydrate, Na2CO3·10H2O) is exposed to a hot atmosphere, it begins to lose water molecules. This process is called efflorescence, where hydrated salts release water into the air. As a result, washing soda becomes powdery and turns into anhydrous sodium carbonate (Na2CO3). This is a physical change, where the crystalline structure changes due to the loss of water, but the chemical composition of the salt remains the same.

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A. gains water molecules and dissolves in them

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B. gains heat from the Sun and becomes dry

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D. loses water molecules but remains in crystal form

When washing soda is exposed to hot atmosphere for a long time, it:

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