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प्रश्न
Write down the changes that will be seen in the instance and explain the reason behind them.
Dilute HCl was added to the limestone.
उत्तर
Limestone is calcium carbonate. When limestone is added to a 10% solution of dilute HCl, then brisk effervescence of CO2 is released due to the reaction of the acid with the carbonate of metals.
2HCl + CaCO3 → CaCl2 + CO2 + H2O
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