The variation of pH during the titration of 0.5 N Na_2CO_3 with 0.5 N HCl is shown in the given graph.The following table indicates the colour and pH ranges of different indicators : {:("Indicator","Range of colour change","Colour in acid","Colour in base"),("Thymol blue",1.2 "to" 2.8,"Red","Yellow"),("Bromocresol red",4.2 "to" 6.3,"Red","Yellow"),("Bromothymol blue",6.0"to"7.6,"Yellow","Blue"),("Cresolphethalein",8.2 "to" 9.8,"Colourless","Red"):} Based on the graph and the table which of the following statements are true ?

The variation of pH during the titration of 0.5 N Na_2CO_3 with 0.5 N

1.	The variation of pH during the titration of 0.5 N Na_2CO_3 with 0.5 N HCl is shown in the given graph.The following table indicates the colour and pH ranges of different indicators : {:("Indicator","Range of colour change","Colour in acid","Colour in base"),("Thymol blue",1.2 "to" 2.8,"Red","Yellow"),("Bromocresol red",4.2 "to" 6.3,"Red","Yellow"),("Bromothymol blue",6.0"to"7.6,"Yellow","Blue"),("Cresolphethalein",8.2 "to" 9.8,"Colourless","Red"):} Based on the graph and the table which of the following statements are true ?
Answer» The FIRST equivalence point can be DETECTED by cresolphthalein The complete neutralisation can be detected by bromothymol blue The SECOND equivalence point can be detected by bromocresol red. The volume of HCl required for the first equivalence point is half the volume of HCl required for the second equivalence point. Solution :(A)First equivalence point pH is in between 8-10 and also this point is in between 8.2 to 9.8 (Indicator range of cresolphthalein) (B),( C) second equivalence point (complete NUTRALISATION) (D)`50/2=25`