Consider the following case -1 CUSO4 and with Zn , case -2 HCI Zn, case -3 Cuso and with Fe,case -4 NaOH and with Al. In which of the given cases a gas is released?
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I think case 2 is the answer
Metal + acid---- salt +H2 gas
Zn + 2HCl ----- ZnCl2 + H2
Metal + acid---- salt +H2 gas
Zn + 2HCl ----- ZnCl2 + H2
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