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Consider the following reactions : (i) Dilute hydrochloric acid reacts with sodium hydroxide. (ii) Magnesium oxide reacts with dilute hydrochloric acid. (iii) Carbon dioxide reacts with sodium hydroxide. It is found that in each case :
An aqueous solution turns phenolphthalein solution pink. When another aqueous solution is added to this pink solution, the pink colour disappears. Now when a few drops of the first solution are added to the reaction mixture, the mixture appears pink again. The respective changes in the nature of the solution are from :
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