Q.15. Which of the following chemical reactions represents an acid-base reaction? a) HBr + NaOH → NaBr + H2O
b) 2NaCl + F2 2NaF + Cl2
c) Zn + CuSO4 → ZnSO4 + Cu
d) C10H8 + 12O2 → 10CO2 + 4H2O

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?