4) In the laboratory preparation of hydrogen gas which impurities can be removed by
passage of impure hydrogen gas through lead nitrate solution?
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Removal of impurities: The impure hydrogen gas can be purified by passing it through the following solutions: (i) Lead nitrate solution [Pb (NO3)2] - It absorbs H2S. (ii) Silver nitrate solution (AgNO3) - It absorbs PH3 and AsH3. (iii) Caustic potash (solid KOH) - It absorbs CO2, SO2 and oxides of nitrogen.
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