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Write the equations for the laboratory preparation of: 

1. Sodium sulphate (Na2SO4 ) using dil. H2SO4

2. Lead sulphate (PbSO4 ) using dil. H2SO4

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1. 2NaOH + H2SO4 (dil) → Na2SO4 + 2H2

2. Pb(NO3 )2 + H2SO4 (dil) → PbSO4 + 2HNO3

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