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    Question

    In calcareous soil, effervescence is visible when

    treated with diluted 0.1 N HCl due to release of which of the following?
    A NO2 Correct Answer Incorrect Answer
    B CO2 Correct Answer Incorrect Answer
    C SO2 Correct Answer Incorrect Answer
    D CH4 Correct Answer Incorrect Answer
    E N2 Correct Answer Incorrect Answer

    Solution

    CaCO3 + 2HCl = H2O + CO2(g) +Ca2+ + 2Cl- Calcareous soil that contains enough free calcium carbonate to effervesce visibly, releasing carbon-dioxide gas, when treated with cold 0.1 N hydrochloric acid,

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