In an ore the oxidisable is Sn^(2+). Thi...

In an ore the oxidisable is `Sn^(2+)`. This is ore is titrated with a dichromate solution containing 2.5 g `K_(2)Cr_(2)O_(7)` in 0.50 litre. A 0.40 g of sample of the ore required 10.0 `cm^(3)` of the titrant to reach equivalent point. If the percentage of tin in ore is x, then what is the value of x/5 ? (K=39.1,Cr=52, Sn=118.7)

0.15

0.25

0.3

0.67

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In an ore, the only oxidizable material is Sn^(2+) . This ore is titrated with a dichromate solution containing 2.5g of K_(2)Cr_(2)O_(7) in 0.5 "litre" . A 0.40 g sample of the ore required 10.0 cm^(3) of titrant to reach equivalence point. Calculate the percentage of tin in ore.

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A 0.5 g sample containing MnO_(2) is treated with HCl liberating Cl_(2) is passed into a solution of KI and 30.0 " mL of " 0.1 M Na_(2)S_(2)O_(3) are required to titrate the liberated iodine. Calculate the percentage of MnO_(2) is the sample.

0.5 gmixture of K_(2)Cr_(2)O_(7) and KMnO_(4) was treated with excess of KI in acidic medium. Iodine liberated required 150 cm^(3) of 0.10 N solution of thiosulphate solution for titration. Find trhe percentage of K_(2)Cr_(2)O_(7) in the mixture :

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