Question

sample of 1 gram of aluminium are treated separately with an excess of sulphuric acid and an excess of sodium hydroxide the ratio of number of moles of hydrogen gas evolved is

Answer 1

1) H2SO4 (excess)
       2 Al + 3 H2SO4→Al2(SO4)3 + 3H2
 
2) NaOH(excess)
    ​​​​2 Al + 2NaOH +  2H2O → 2NaAlO2 + 3H2

Ratio of volumes of hydrogen evolved  = 3:3 ie.1:1

Answer 2

Hope this helps you.