For the following questions answer them individually
The first and second ionization constants of $$H_{2}X$$ are $$2.5 \times 10^{-8}$$ and $$1.0 \times 10^{-13}$$ respectively. The concentration of $$X^{2-}$$ in $$0.1 MH_{2} X$$ solution is _________ $$\times 10^{-15}M$$. (Nearest Integer)
A substance 'X' (1.5 g) dissolved in 150 g of a solvent 'Y'(molar mass=300 g $$mol^{-1}$$ ) led to an elevation of the boiling point by 0.5 K. The relative lowering in the vapour pressure of the solvent 'Y' is __________ $$\times 10^{-2}$$. (nearest integer)
[Given : $$K_{b}$$ of the solvent =5.0 K kg $$mol^{-1}$$]
Assume the solution to be dilute and no association or dissociation of X takes place in solution.
The osmotic pressure of a living cell is 12 atm at 300 K. The strength of sodium chloride solution that is isotonic with the living cell at tltis temperature is __________ $$g L^{-1}$$.
(Nearest integer)
Given: R = 0.08 L atm $$K^{-1} mol^{-1}$$
Assume complete dissociation of NaCl
(Given : Molar mass of Na and Cl are 23 and 35.5 g $$mol^{-1}$$ respectively.)
MX is a sparingly soluble salt that follows the given solubility equilibrium at 298 K.
$$MX(s) \rightleftharpoons M^{+} (aq)+X^{-}(aq); K_{sp}=10^{-10}$$
If the standard reduction potential for $$M^{+}(aq)\xrightarrow {+e^{-}}M(s)$$ and $$\left(E_{M^{+}/M}^\ominus\right)=0.79V$$, then the value of the standard reduction potential for the metal/metal insoluble salt electrode $$E^{\ominus}_{X^{-}/MX (s)/M }$$ is __________mV.(nearest integer)
[Given : $$\frac{2.303RT}{F} = 0.059V$$]
Identify the metal ions among $$Co^{2+}, Ni^{2+}, Fe^{2+}, V^{3+} \text{ and } Ti^{2+}$$ having a spin-only magnetic moment value more than 3.0 BM. The sum of unpaired electrons present in the high spin octahedral complexes formed by those metal ions is __________.
