Be < Mg < Ca < Sr < Ba

Ba < Sr < Ca < Mg < Be

Mg < Be < Ca < Sr < Ba

Be < Ca < Mg < Sr < Ba

Na

K

Mg

Mn

Copper

Phosphorus

Mercury

Magnesium

An alkali metal

A noble metal

An alkaline earth metal

None of these

${\rm{MgO}}$

${\rm{CuS}}{{\rm{O}}_4}$

${\rm{FeS}}{{\rm{O}}_4}$

${\rm{MgS}}{{\rm{O}}_4}$

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.

Dicalcium silicate

Tricalcium silicate

Tricalcium aluminate

Tetracalcium aluminoferrate

40%

47.8%

52.2%

60%

Barium sulphate and zinc sulphide

Barium sulphide and zinc sulphide

Calcium sulphate and zinc sulphide

Calcium sulphide and zinc sulphide

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

${\rm{MgS}}{{\rm{O}}_4}.7{{\rm{H}}_2}{\rm{O}}$

${\rm{MgS}}{{\rm{O}}_4}.2{{\rm{H}}_2}{\rm{O}}$

${\rm{BaS}}{{\rm{O}}_4}.2{{\rm{H}}_2}{\rm{O}}$

Mg

Al

P

S