Na2CO3 and NaHCO3 may be distinguised by treating their aqueous solution with

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Litmus solution

Dil acetic acid

MgO

Phenophthalein

answer is D.

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Detailed Solution

aq.Na2CO3 is more basic than aq.NaHCO3Reason: aq.NaHCO3 & aq.Na2CO3 both being alkaline gives yellow colour with basic indicator like methyl orangeaq.Na2CO3 being strong base gives pink colour with the acid indicator phenolpthaleinaq.NaHCO3 is weakly alkaline and still contains acidic hydrogen and can't ionise the phenolpthalein indicatorTherefore, Phenolphthalein indicator is colour less in aq.NaHCO3 solution where as phenolphthalein indicator is becomes pink colour in aq.Na2CO3 solution Ph-H⇌OH-Unionised form Ph-[Pink Colour] [Colour less] ionised Form

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