200 ML of 1m H2SO4 ,300 ML 3M HCl and 100ML of 2M HCl are mixed and made up to 1 litre .

The protron concentration in the resulting solution is

1. 1.25M 2. 1.5M 3. 2.5M 4. 0.75M

1M H2SO4 solution has 2M H+ ions.
Therefore, moles of H+ in:
200 ml of 1M H2SO4 = 2 x 0.2L  x 1mol/L  =  0.4
  300 ml of 3M HCl = 0.3L x 3mol/L  = 0.9
  100ML of 2M HCl= 0.1L x 2mol/L = 0.2
Total moles of H+ ions = 0.4 + 0.9 + 0.2
  = 1.5
Total volume = 1 L
So, [H+] = 1.5mol/L

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