Consider the addition of ${\mathrm{MgF}}_2$ and ${\mathrm{CaF}}_2$ in water as given in (a) and (b)
(a) $4.96\mathrm{mg}$ of ${\mathrm{MgF}}_2$ in $125\mathrm{mL}$ of pure water ${\mathrm{K}}_{\mathrm{sp}}$ of ${\mathrm{MgF}}_2=3.2\times {10}^{-8}$
(b) $3.9 \mathrm{mg}$ of $\mathrm{CaF}_{2}$ in $100 \mathrm{~mL}$ of pure water, ${\mathrm{K}}_{\mathrm{sp} }$ of ${\mathrm{CaF}}_2=4\times {10}^{-12}$. Choose the correct statement(s) from amongst the following.

Consider the equilibria:

1. $\mathrm{Hb}\left(\mathrm{aq}.\right)+4{\mathrm{O}}_2\left(\mathrm{g}\right)\rightleftharpoons \underset{\left(\mathrm{light} \mathrm{red}\right)}{\mathrm{Hb}{\left({\mathrm{O}}_2\right)}_4}\left(\mathrm{aq}.\right) ; {\mathrm{K}}_{{\mathrm{C}}_1}$

2. $\mathrm{Hb}(\mathrm{aq}.)+4\mathrm{CO}\left(\mathrm{g}\right)\rightleftharpoons \underset{\left(\mathrm{deep} \mathrm{red}\right)}{\mathrm{Hb}{\left(\mathrm{CO}\right)}_4}\left(\mathrm{aq}.\right) ; {\mathrm{K}}_{{\mathrm{C}}_2}$

($\mathrm{Hb}=$Haemoglobin in blood)

Identify the correct statement(s):

The following represent the variation of $\mathrm{pH}$ with acid strength $\mathrm{pKa}$ for $0.10\mathrm{M}$ aqueous solutions, Marked as $\mathrm{a},\mathrm{b}$ and $\mathrm{c}$.

Select the correct matchings:

At $1467°\mathrm{C}$, the progress of the reaction:
$\mathrm{xA}\left(\mathrm{g}\right)\rightleftharpoons \mathrm{yB}\left(\mathrm{g}\right)$
in a $1\mathrm{L}$ vessel is presented in the following figure:

Identify the correct statement(s):

Determine the concentration of ${\mathrm{NH}}_3$ solution, one litre of which can dissolve $0.10 \mathrm{mole}$ $\mathrm{AgCl}. {\mathrm{K}}_{\mathrm{sp}}$ of $\mathrm{AgCl}$ and ${\mathrm{K}}_{\mathrm{f}}$ of $\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2^{+}$ are $1.0\times {10}^{-10} {\mathrm{M}}^2$ and $1.6\times {10}^7 {\mathrm{M}}^{-2}$ respectively.