1.8 x 10$^{-11}$

5.6 x 10$^{-12}$

1.1 x 10$^{-11}$

3.2 x 10$^{-13}$

$MgC{O_3}$

$N{a_2}C{O_3}$

${K_2}C{O_3}$

$R{b_2}C{O_3}$

Highly conducting

Highly reducing

Paramagnetic

All are correct

${\rm{CaS}}{{\rm{O}}_4}$

Orthorhombic ${\rm{CaS}}{{\rm{O}}_4}.2{{\rm{H}}_2}{\rm{O}}$

${\rm{CaS}}{{\rm{O}}_4}{\rm{.}}{{\rm{H}}_2}{\rm{O}}$

Monoclinic ${\rm{CaS}}{{\rm{O}}_4}.2{{\rm{H}}_2}{\rm{O}}$

${\rm{CaSi}}{{\rm{O}}_4}$

${\rm{CaC}}{{\rm{O}}_3}$

${\rm{Ca}}{{\rm{F}}_2}$

${\rm{NaAI}}{{\rm{F}}_6}$

${\rm{PbC}}{{\rm{l}}_2}$

${\rm{AgCl}}$

${\rm{BaS}}{{\rm{O}}_4}$

None of these

$Be > Mg > Ca > Sr > Ba$

$Mg > Be > > Ba > Ca > Sr$

$Be > Ca > Mg > Ba > > Sr$

$Mg > Ca > Ba > > Be > Sr$

Mg at cathode and Cl₂ at anode

K at cathode and O₂ at anode

H₂ at cathode and O₂ at anode

Mg at anode and Cl₂ at cathode

$MgCl_2$

$CaCl_2$

$SrCl_2$

$BeCl_2$

The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group

In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group

Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens

In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group.

${\rm{CaC}}{{\rm{O}}_3}$

${\rm{Ca}}{{\rm{F}}_2}$

${\rm{CaS}}{{\rm{O}}_4}$

${\rm{C}}{{\rm{a}}_3}{\left( {{\rm{P}}{{\rm{O}}_4}} \right)_2}$