218) What amount of Cl₂ gas liberated at anode, if 1 A current is passed for 3 min from NaCl solution?

219) 100 mL HCN of 0.1M is titrated with 100 mL 0.1M NaOH solution. At the neutral point, pH of this solution will be: (pK_a of HCN = 4.74)

220) The pH of blood is 7.4. If the buffer in blood is CO₂ and HCO₃⁻, then the ratio of conjugate base to acid (H₂CO₃) to maintain the pH of the blood will be:

221) 1 L of saturated solution of MgCl₂ is evaporated to dryness, due to which 20 mg of residue is left. What is the solubility product of MgCl₂ of that solution?

222) 10 mL of 0.2M acid is added to 250 mL of a buffer solution with pH = 6.34. The pH of the solution becomes 6.32. The buffer capacity of the solution is: