Chemistry - Complete s-block Question with Solution | TestHub

$\mathrm{Na}$ gives golden-yellow

$\mathrm{Ca}$ gives brick-red.

$\mathrm{Ba}$ gives apple-green

$\mathrm{Li}$ gives crimson.

$\mathrm{Sr}$ gives crimson-red

$\mathrm{K}$ gives lilac.

${\mathrm{BeCl}}_2$ and ${\mathrm{MgCl}}_2$ do not give characteristic flame colours: the electrons are held too strongly for excitation by the Bunsen flame.

Hence the required count is $6$.