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प्रश्न
Give a chemical test to distinguish between the given pairs of chemicals:
Lead nitrate solution and Zinc nitrate solution
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उत्तर
Lead nitrate and Zinc nitrate solution can be distinguished by passing H2S in solution
`Pb(NO_3)_2` will give the black precipitate of PbS whereas `Zn(NO_3)_2`will not.
`Pb^2+ + H_2S -> PbS↓ + 2H^(+)`
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