pH in Digestive System

Q.

What can be used to treat a bee sting?

Q. Identify X in the following reaction:
$HCl$ + X $\to$ $NaCl$ + $H_{2}C{O}_3$
$H_{2}C{O}_3$ $\to$ $H_{2}O$ + $C{O}_2$

1. $N{a}_{2}C{O}_3$
2. $NaHC{O}_3$
3. $NaOH$
4. None of these

Q.

What can be used to treat a bee sting?

Q.

${\mathrm{CaCO}}_3+2\mathrm{HCl}\to \mathrm{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}$

1. ${\mathrm{CaCl}}_2+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2(\downarrow )$

2. ${\mathrm{CaCl}}_2+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2(\uparrow )$

3. ${\mathrm{CaCl}}_2+{\mathrm{H}}_2+{\mathrm{CO}}_2(\uparrow )$

4. ${\mathrm{CaCl}}_2+{\mathrm{H}}_2\mathrm{O}+\mathrm{CO}(\uparrow )$