Write about the indicators and it's type.
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hlo......
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An indicator is a substance that changes its colour in acidic and basic medium.An indicator shows one colour in acidic medium and different colour in basic medium so that they are called indicators. eg:-Litmus , turmeric. _______________________________ TThere are three types of economic indicators, depending on their timing: leading, lagging, and coincident indicators. Leading indicators signal changes before the economy as a whole change....
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Natural substance indicators:
China rose and litmus
Artificial substance indicators ,
methyl orange
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