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(i) The substance is Na base 2O base 2. When dissolved in water, the solution becomes alkaline with the liberation of H base 2O base 2 Na base 2O base 2 + 2H base 2O ? 2NaOH + H base 2O base 2
NOTE : Due to the alkaline solution, the red litmus paper will turn into blue, which subsequently changes into white due to oxidation caused by H base 2O base 2.
(ii) The substance Na base 2O merely produces alkaline solution and thus the red litmus paper will turn into blue.
Na base 2 + H base 2O ? 2NaOH
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