MCQ
The conjugate base of $HCO_3^ - $ is
- A${H_2}C{O_3}$
- ✓$CO_3^{2 - }$
- C$C{O_2}$
- D${H_2}O$
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(First dissociation constant of $H _{2} CO _{3}=4.0 \times 10^{-7}$$\log 2=0.3 ;$ density of the soft $\left.\operatorname{drink}=1\, g\, mL ^{-1}\right)$
