Which of the following will decrease the pH of a 50 ml solution of `0.01 M HCI` ?

Which of the following will decrease the pH of a 50ml solution of 0.01M HCl?

Which of the following will be present in the soluiton formed when 50mL of 0.1 M HCl is mixed with 50mL of 0.1 M NaOH ?

What is the pH of a solution containing 0.01 mol HCI L^(-1) ?

Calculate pH of 0.01 M HCI solution.