4.
用“\(\rm{ > }\)”或“\(\rm{ < }\)”回答下列问题:
\(\rm{(1)}\)酸性:\(\rm{H_{2}CO_{3}}\)______\(\rm{H_{2}SiO_{3}}\),\(\rm{H_{2}SiO_{3}}\)______\(\rm{H_{3}PO_{4}}\);
\(\rm{(2)}\)碱性:\(\rm{Ca(OH)_{2}}\)__________\(\rm{Mg(OH)_{2}}\)__________\(\rm{Al(OH)_{3}}\);
\(\rm{(3)}\)气态氢化物稳定性:\(\rm{H_{2}O}\)__________\(\rm{H_{2}S}\),\(\rm{H_{2}S}\)__________\(\rm{HCl}\);