Question

A0.518 g sample of lime stone is dissolved in HCl and then the calcium is precipitated as CaCO,. After
filtering and washing the precipitate, it requires 40 ml of 0.25 N KMnO solution acidified with H, SO to
titrate it as,
Mno: + H+ + 0,03 Mn* + CO, + HO
The percentage of CaO in the sample is
(1) 54%
(2) 27.1%
(3) 42%
(4) 84%

Answer 1

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