See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

2 3 3 Na CO NaHCO  x 3 2 3 NaHCO H CO  x 3 2 3 NaHCO H CO  y With phenolphthalein as indication 10 mL  1N  2 2 mill g. equation = x with methyl orange as indicator 10mL  0.2N  4 milli gram equation = x + y y = 2 mili gram eq. Normality = 2millgram eq.