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Q.

A 0.518 g sample of limestone is dissolved in HCI and then the calcium is precipitated as CaC2O4. After filtering and washing the precipitate, it requires 40.0 mL of 0.250 N KMnO4 solution acidified with H2SO4 to titrate it as. The percentage of CaO in the sample is:MnO4−+H++C2O42−⟶Mn2++CO2+2H2O

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a

54.0%

b

27.1%

c

42%

d

84%

answer is A.

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Detailed Solution

M eq. of KMnO4=M eq. of C2O4−2=M eq. of CaCO340×.25=M eq. of CaO10×10−32= Mole of CaO%CaO=5×10−3×56×100.518=54%
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A 0.518 g sample of limestone is dissolved in HCI and then the calcium is precipitated as CaC2O4. After filtering and washing the precipitate, it requires 40.0 mL of 0.250 N KMnO4 solution acidified with H2SO4 to titrate it as. The percentage of CaO in the sample is:MnO4−+H++C2O42−⟶Mn2++CO2+2H2O