200 ml of 1 M $H_{2}S{O}_4$, 300 ml of 3 M $HCl$ and 100 ml of 2 M $HCl$ are mixed and made up to 1 litre. The proton concentration in the resulting solution is:

Q. 100 mL of a 0.1 M HCl solution, 200 mL of a 0.2 M HCl solution, 300 mL of a 0.3 M HCl solution, 400 mL of a 0.4 M HCl solution and 500 mL of a 0.5 M HCl solution are mixed. 200 mL of this solution is diluted with 300 mL of water. What is the molarity of HCl in the resultant solution?

Q. 100 mL of a 0.1 M HCl solution, 200 mL of a 0.2 M HCl solution, 300 mL of a 0.3 M HCl solution, 400 mL of a 0.4 M HCl solution and 500 mL of a 0.5 M HCl solution are mixed. 200 mL of this solution is diluted with 300 mL of water. What is the molarity of HCl in the resultant solution?

Q. 300 ml 0.1 M HCl and 200 ml of 0.03 M $H_{2}S{O}_4$ are mixed. Calculate the normality of the resulting mixture.

Q. $200$ mL of $1$ M $HCl$ is mixed with $300$ mL of $6$ M $HCl$ and the final solution is diluted to $1000$ mL. The molar concentration of $\left[H^{+}\right]$ ion is:

Q. Calculate the molarity of the resultant solution in each of the following cases:
i. 200 mL of 1 M HCl + 300 mL water
ii. 200 mL of 1 M HCl + 100 mL of 0.5 M HCl