JEE (Advanced) 2012 Paper-2
For the following questions answer them individually
$$NiCl_2\left\{P (C_2H_5)_2(C_6H_5)\right\}_2$$ exhibits temperature dependentmagnetic behaviour (paramagnetic/ diamagnetic). the coordination geometries of $$Ni^{2+}$$ in the paramagnetic and diamagnetic states are respectively
The reaction of white phosphorous with aqueous NaOH gives phosphine along with another phosphorus containing compound. The reaction type; the oxidation states of phosphorous in phosphine and the other product are respectively
In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are
Using the data provided, calculate the multiple bond energy $$(kJ mol^{-1})$$ of a $$C \equiv C$$ bond $$C_2H_2$$. That energy is (take the bond energy of a C-H bond as 350 kJ $$mol^{-1}$$)
$$2C(s) + H_2(g) \rightarrow C_2H_2(g)$$ $$\triangle H = 225 kJ mol^{-1}$$
$$2C(s) \rightarrow 2C(g)$$ $$\triangle H = 1410 kJ mol^{-1}$$
$$H_2(g) \rightarrow 2H(g)$$ $$\triangle H = 330 kJ mol^{-1}$$
For a dilute solution containing 2.5 g of a non- volatile non- electrolyte solute in 100 g of water, the elevation in boiling point at 1 atm pressure is $$2^\circ C$$. Assuming concentration of solute is much lower than the concentration of solvent, the vapour pressure (mm of Hg) of the solution is (take $$K_b = 0.76$$ K kg $$mol^{-1}$$)
The electrochemical cell shown below is a concentration cell.
$$M \mid M^{2+}$$ (saturated solution of a sparingly soluble salt, $$MX_2$$) $$\parallel M^{2+}$$ (0.001 mol $$dm^{-3}$$) $$\mid M$$
The emf of the cell depends on the difference in concetration of $$M^{2+}$$ ions at the two electrodes. The emf of the cell at 298 is 0.059 V
The solubility product ($$K_{sp};mol^3 dm^{-9}$$) of $$MX_2$$ at 298 based on the information available the given concentration cell is (take $$2.303 \times R \times \frac{298}{F} = 0.059 V$$)
The value of $$\triangle G (kJ mol^{-1})$$ for the given cell is (take 1F = 96500 C $$mol^{-1}$$)
