write the balanced chemical equation of the following
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Explanation:
3. 4HNO3(l) + Cu(s) ==> Cu(NO3)2 (s and aq) + 2NO2(g) + 2H2O(l)
4. NaHSO3 +HCl =====> NaCl +H2O +SO2
5. PbS(s) + 2HCl(aq) =====> PbCl2(s)+H2S(g)
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