5

7

9

3

${\rm{NaZn}}{{\rm{O}}_2}$

${\rm{N}}{{\rm{a}}_2}{\rm{Zn}}{{\rm{O}}_2}$

${\rm{N}}{{\rm{a}}_2}{\rm{Z}}{{\rm{n}}_2}{{\rm{O}}_2}$

${\rm{None of these}}$

${\rm{HSO}}_4^ -$

${\rm{HCO}}_3^ -$

${{\rm{H}}_2}{\rm{PO}}_4^ -$

${\rm{HCO}}{{\rm{O}}^ - }$

Gives a pair of protons

Donates a proton

Accepts an electron pair

Gives ${\rm{O}}{{\rm{H}}^ - }$ ions in aqueous solution

${{\rm{H}}_3}{\rm{P}}{{\rm{O}}_4}$

${{\rm{H}}_4}{{\rm{P}}_2}{{\rm{O}}_7}$

${\rm{HP}}{{\rm{O}}_3}$

All of these

an acid

a base

both an acid and a base

neither an acid nor a base

BF₃

CH₄

NH₃

CO₂

${\rm{N}}{{\rm{H}}_3}$

${{\rm{H}}_2}{\rm{O}}$

${{\rm{B}}_2}{{\rm{H}}_6}$

${\rm{C}}{{\rm{H}}_4}$

Dissolve readily in non-polar solvent

Conduct electricity in aqueous solution

Dissociate into ions at high concentration

None of the above

${\rm{HCl}}$

${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$

${\rm{S}}{{\rm{O}}_2}$

${\rm{HN}}{{\rm{O}}_3}$

${\rm{O}}{{\rm{H}}^ - }$

$R{O^ - }$

${\rm{NH}}_2^ -$

${R^ - }$