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#Engineering

According to Bohr's atomic theory : (A) Kinetic energy of electron is $\alpha \frac{Z^{2}}{n^{2}}.$ (B) The product of velocity (v) of electron and principal quantum number (n), 'vn' $\alpha\; Z^{2}$ (C) Frequency of revolution of electron in an orbit is $\alpha \frac{Z^{3}}{n^{3}}.$ (D) Coulombic force of attraction on the electron is $\alpha \frac{Z^{3}}{n^{4}}.$ Choose the most appropriate answer from the options given below :

Option: 1 (C) only
Option: 2 (A) and (D) only
Option: 3 (A) only
Option: 4 (A), (C) and (D) only

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50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If pK_b of ammonia solution is 4.75, the pH of the mixture will be :
Option: 1 3.75
Option: 2 4.75

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