Find the velocity (ms^-1) of electron in first Bohr's orbit of radius a₀. Also find the de Broglie's wavelength (in m). Find the orbital angular momentum of 2p orbital of hydrogen atom in units of $$h/2 \pi$$.

(a). For the reaction
Ag⁺ (aq) + Cl^- (aq) $$\leftrightharpoons$$ AgCl (s)
Given:

Species	$$\Delta G_f^o$$ (kJ/mol)
Ag+ (aq)	+77
Cl- (aq)	-129
AgCl (s)	-109

Write the cell representation of above reaction and calculate $$E_{cell}^o$$ at 298 K. Also find the solubility product if AgCl.
(b) If 6.539 $$\times$$ 10^-2 g of metallic zinc is added to 100 ml saturated solution of AgCl. Find the value of $${\log _{10}}{{\left[ {Z{n^{2 + }}} \right]} \over {{{\left[ {A{g^ + }} \right]}^2}}}$$. How many moles of Ag will be precipitated in the above reaction. Given that
Ag⁺ + e^- $$\to$$ Ag; E^o = 0.80 V;
Zn²⁺ + 2e^- $$\to$$ Zn; E^o = -0.76 V;
(It was given that atomic mass of Zn = 65.39)

At constant temperature and volume, X decomposes as 2X(g) $$\to$$ 3Y(g) + 2Z(g); P_x is the partial pressure of X.
(i) What is the order of the reaction to X?
(ii) Find the rate constant
(iii) Find the time for 75% completion of the reaction.
(iv) Find the total pressure when pressure of X is 700 mm of Hg

If one the vertices of the square circumscribing the circle $$\left| {z - 1} \right| = \sqrt 2 \,is\,2 + \sqrt {3\,} \,i$$. Find the other vertices of the square.