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Q.

During the titration of a mixture of Na2CO3 and NaHCO3 against HCl

             

        

           

         

 

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a

 methylorange is used to detect the first end point

b

   Phenolphthalein is used to detect the first end point      

c

   Phenolphthalein is used to detect the second end point

d

   methylred is used to detect the first end point          

answer is A.

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Detailed Solution

Phenolphthalein shows color change when Na2CO3 changes into NaHCO

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