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0.250 L*3M=0.250 L*3mol/L= 0.750 mol
Answer is :c) Gas(hydrogen sulfide)
During selection of indicator. We choose an indicator which have pH range equivalent to the pH change of reaction to give better result and better observation.
So there are some different indicator are used in table 2 as compared to the table 1.
- Alizarin and phenolphthalein are basic indicator and their pH range is more than 8 so they are used in table 2
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I'd say b, but i'm not 100 percent sure.<span />
