Sir.. could you please help to answer question no. 12 chemistry paper 2012.. booklet a4
q)which one of the following will decrease the pH of 50ml of 0.01M HCl?
a)addition of 50ml of 0.01Mhcl
b) addn of 50ml of 0.002M HCl
c)addn of 150ml of 0.002M HCl
D) addn of 5ml of 1M HCl
e) addn of mettalic zinc... plz

Hint: Adding any amount of a stronger concentration of HCl will lower the pH.