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Among the mixutre (i) 50 ml of N//10 H...

Among the mixutre
(i) `50 ml` of `N//10 HCl + 50 ml` of `N//10 NaOH`
(ii) `55 ml` of `N//10 HCl + 45 ml` of `N//10 NaOH`
(iii) `75 ml` of `N//10 HCl + 25 ml` of `N//10 NaOH`
(iv) `30 ml` of `N//5 HCl + 70 ml` of `N//5 NaOH`
For how many of the above mixutres pH lies between 1 to 7

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