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A sample consisting of chocolate-brown poweder of `PbO_2` is allowed to react with excess of Kl and iodine liberated is reacted with `N_2H_4` in another container. The volume of gas liberated from this second container at STP was measured out to be 1.12 litre.Find out volume of decimolar NaOH required to dissolve `PbO_2` completely. (Assume all reactions are 100% complete). Give your answer divide by 100.

Answer» Correct Answer - 20
`PbO_2+4KItoPbI_2+I_2+2K_2O`
`N_2H_2+2I_2toN_2+4HI`
moles of `N_2` liberated `=11.2/22.4=5xx10^(-2)` mole
mole of `PbO_2` reacted `=10^(-1)` mole
`PbO_2+2H_2OtoPb(OH)_4`
`pb(OH)_4+2NaOHtoNa_2[Pb(OH)_6] or Na_2PbO_2`
mole of NaOH required `=10^(-1)xx2`
`Vxx1/10xx10^3=2xx10^(-1) " " V=2/10^(-3)=2000` ml


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