For the following questions answer them individually
Consider the following electrochemical cell : $$Pt| O_{2}(g)(1 bar) | HCl(aq)||M^{2+}(aq,1.0M)|M(s)$$
The pH above which , oxygen gas would start to evolve at anode is ____ (nearest integer).
[Given: $$E_{M^{2+}/m}^\circ = 0.994V$$ , $$E_{O^{2}/H_{2}O}^\circ = 1.23V$$ are standard reduction potential and $$\frac{RT}{F}(2.303)=0.059V$$ at the given condition]
Consider $$A \xrightarrow{k_1} B$$ and $$ C \xrightarrow{k_2} D$$ are two reactions. If the rate constant ($$k_{1}$$) of the $$A \rightarrow B$$ reaction can be expressed by the followmg equation $$\log_{10}K = 14.34- \frac{1.5 \times 10^{4}}{T/K}$$ and activation energy $$C\rightarrow D$$ reaction ($$Ea_{2}$$) is $$\frac{1}{5}th$$ of the $$A\rightarrow B$$ reaction ($$Ea_{1}$$), then the value of ($$Ea_{2}$$) is _____________kJ $$mol^{-1}$$. (Nearest Integer)
Among the following oxides of 3d elements, the number of mixed oxides are ___________.
$$Ti_{2}O_{3}, V_{2}O_{4}, Cr_{2}O_{3},Mn_{3}O_{4},Fe_{3}O_{4}, Fe_{2}O_{3},Co_{3}O_{4}$$
If the enthalpy of sublimation of Li is 155 kj $$mol^{-1}$$, enthalpy of dissociation of $$F_{2}$$ is 150 kj $$mol^{-1}$$, ionization enthalpy of Li is 520 kj $$mol^{-1}$$, electron gain enthalpy of F is - 313 kj $$mol^{-1}$$, standard enthalpy of formation of LiF is - 594 kj $$mol^{-1}$$. The magnitude of lattice enthalpy of LiF is _________ kJ $$mol_{-1}$$. (Nearest Integer)
The mass of benzanilide obtained from the benzoylation reaction of 5.8 g of aniline, if yield of product is 82%, is ____ g (nearest integer) .
(Given molar mass in g $$mol^{-1}$$ H : 1, C: 12, N: 14, O : 16)
