why lead can not be used in the preparation of hydrogen dilute acid
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Lead is above hydrogen in the metal activity series ( H2 is included for comparison of reactivity with other metals). So it can displace H from compounds.
In the reactions with acids, insoluble salts of lead are produced which forms a coating on pure lead and prevents the reaction from proceeding further. Thus, Pb is not used to prepare H2.
In the reactions with acids, insoluble salts of lead are produced which forms a coating on pure lead and prevents the reaction from proceeding further. Thus, Pb is not used to prepare H2.
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