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What is the role of HCl gas in the purif...

What is the role of HCl gas in the purifications of common salt?

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  14. Write the expressions of solubility products for the following salts ...

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  15. What is the role of HCl gas in the purifications of common salt?

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  17. Menstion the nature of aqueous solutoins of following salts. NH4NO3

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