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16. With the help of an activity, demonstrate how do we
know that a chemical reaction has taken place?
17. HOTS A water insoluble substance X on reaction with
dil. HCl released a colourless and odourless gas
accompanied by brisk effervescence.
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17. A water-insoluble substance X on reaction with dilute hydrochloric acid released a colourless and odourless gas accompanied by brisk effervescence. ... On bubbling the gas through lime water, it initially became milky and milkiness disappeared when the gas was passed in excess.
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